Custom magnetic box: how to specify closure type, pull-force, and surface finish

By Sonia Sun, Founder, Huamei 華美 — since 1992. Published 29 May 2026. Updated 29 May 2026.

Sonia Sun has engineered magnetic closure boxes at Huamei's factories in Henan, Zhejiang, Sichuan, and Guizhou since founding the company in 1992 — across cosmetics, spirits, gifting, and skincare applications where the closure specification is confirmed against the actual product weight and open-close frequency before production is released.

A magnetic box is defined by its closure: a lid held shut by embedded magnets rather than by a press fit, a friction tab, or a latch. The distinction matters because the closure is a physical experience, not just a mechanism — the pull-force felt when opening the box is part of how the product presents itself. For a custom magnetic box, specifying that pull-force correctly is as important as specifying the colour or surface finish. This guide covers how the magnetic closure is constructed, what pull-force to specify for different product weights, and what surface finishes are available.

What is a custom magnetic box?

A custom magnetic box is a rigid greyboard box with embedded neodymium magnets in the lid and base panels that hold the lid closed without a latch. Pull-force at Huamei ranges 6–50 grams at 2,800 Gauss, calibrated to product weight and how frequently the box will be opened. MOQ is 200+ pieces, with samples in 7–10 days.

The word "custom" covers several layers of specification: the box dimensions (sized to the product), the greyboard weight (matched to the product's mass and transit requirements), the magnet array (count, position, and pull-force), the exterior print (full-colour offset with surface finishing), and the interior format (tissue, foam insert, or paperboard tray). A custom magnetic box is specified from the product dimensions up — not selected from a catalogue of standard sizes.

Rigid box construction underpins every custom magnetic box: the greyboard core gives the box its structural rigidity and the mounting surface for the magnetic array. The wrapped exterior carries the print and surface finish. The magnetic closure is embedded in both the lid and base panels at the assembly stage, before the wrap is applied.

How is the magnetic closure constructed?

A magnetic closure is built from neodymium disc magnets set into both the lid and base greyboard panels at opposing poles, so the lid snaps closed without a latch — the magnets are embedded before the paper wrap is applied, making them invisible from the exterior.

The magnetic closure in a custom rigid box uses neodymium (NdFeB) disc or bar magnets embedded in the greyboard panels of the lid and base, positioned opposite each other so the opposing poles attract when the lid closes.

Magnet count. A two-magnet array — one magnet in the lid, one in the base — is standard for boxes up to approximately 250 mm in the longest dimension. A four-magnet array is standard for boxes above 250 mm or for heavy products where the two-magnet pull-force is insufficient to hold the lid flat. Six-magnet arrays are used for wide-format boxes where lid bowing is a concern.

Magnet position. Magnets are centred in the closure edge panels. For a single-edge closure (the lid opens from the front), the magnets are centred in the front panel at 1/3 and 2/3 of the panel width for a two-magnet array. For a wrap-around closure (the lid hinges at the back), the magnet positions are symmetric across the front face.

Greyboard mounting. The magnets are set into recesses cut in the greyboard core at the tooling stage. The wrap paper covers the recess, so no magnet is visible from the exterior or interior surface. The greyboard layer above the magnet is typically 0.5–0.8 mm — thin enough to keep the magnet near the surface for maximum pull-force, thick enough to resist the board punching through under repeated use.

"Magnetic closures at Huamei run 6–50 grams of pull-force at 2,800 Gauss — calibrated to product weight and open-close frequency at the sample stage."

What pull-force should a custom magnetic box have?

Pull-force for a custom magnetic box runs 6–50 grams at 2,800 Gauss at Huamei — with the working range chosen by product weight and how frequently the box will be opened, from 6–15 g for daily-use cosmetics to 30–50 g for heavy display or storage formats.

Pull-force is the resistance a user feels when opening the box — measured in grams at a specified magnetic flux density (2,800 Gauss at Huamei). The appropriate pull-force depends on two variables: the weight of the product inside the box, and how frequently the box will be opened.

For display or storage boxes (opened rarely, product weight 50–200 g). 20–50 g pull-force. A higher pull-force is appropriate here — the box should stay closed on a shelf or in transit without risk of accidental opening. The user will apply deliberate force to open it, so a higher resistance is acceptable.

For daily-use cosmetic boxes (opened multiple times per day, product weight 50–150 g). 8–15 g pull-force. The box should open easily one-handed without effort. A pull-force above 20 g on a daily-use cosmetic box creates friction in the routine.

For gifting and presentation boxes (opened once or a few times, product weight 100–500 g). 10–25 g pull-force. The resistance contributes to the reveal — a deliberate, gradual opening is part of the gifting experience. Too low a pull-force and the lid opens under gravity when the box is tilted; too high and the opening feels effortful rather than intentional.

For heavy-product boxes (product weight over 500 g, e.g. bottle or book formats). 30–50 g pull-force, four-magnet array. The heavier product creates more inertia in transit; the stronger closure holds the lid against vibration and handling forces.

Pull-force is confirmed on a physical sample with the actual product inside the box. Magnetic closure specifications explain the magnet grade, array geometry, and greyboard interaction in detail.

What surface finishes work on a custom magnetic box?

Soft-touch matte laminate, hot-foil stamping, emboss, and spot-UV all work on a custom magnetic box — applied to the wrapped paper exterior the same way as on any luxury rigid box, with soft-touch matte the most common base finish in the premium gifting and cosmetics segments.

The exterior surface of a custom magnetic box is a wrapped coated paper panel — the same substrate used for retail rigid boxes — and accepts the full range of luxury finishing techniques:

Soft-touch matte laminate. The most common finish for premium custom magnetic boxes in cosmetics, skincare, and gifting. The tactile surface reads as considered and premium at the moment of first contact — before the box is opened.

Hot-foil stamping. Huamei's in-house foil palette covers seventeen curated colours. Gold or rose-gold foil on a matte black or navy base is the standard for cosmetic and gifting custom magnetic boxes. The Lavender Orchid cosmetic case uses orchid foil on a soft-touch wrap — a single foil element that carries the brand identity without additional embellishment.

Emboss and deboss. A tactile impression pressed into the wrap surface. Deboss on the brand wordmark — no foil, on a soft-touch base — is the finish language for a restrained luxury register.

Spot-UV over a matte base. A gloss varnish applied selectively over the brand mark or a surface pattern, creating visual contrast on the matte field. Common for custom magnetic boxes in the mid-luxury beauty and gifting segments.

"A custom magnetic box at Huamei is assembled with magnets set into the greyboard panel before wrap application — the closure is a structural element, not an add-on."

The Double-Heart Window custom magnetic box uses a die-cut window in the lid panel to create a product reveal without requiring the lid to be fully opened — a technique that combines a lower pull-force magnetic closure with a structural transparency element.

What is the MOQ and lead time for a custom magnetic box?

Custom magnetic boxes at Huamei start at MOQ 200+ pieces across all rigid box formats. Sample lead time is 7–10 days from confirmed brief and artwork; production lead time is 15–20 days from press start after sample sign-off.

The sample process for a custom magnetic box confirms pull-force, lid-to-base alignment, closure consistency across 50 open-close cycles, and surface finish quality — before the production run is released.

Huamei holds FSC, BSCI, CE, EQS, and SGS certifications. All four factories run on >80% solar energy, providing the supply-chain sustainability documentation needed for US and EU retail buyer audits.

Begin a custom magnetic box brief →

Sources

• FSC, https://fsc.org/en
• Huamei first-party data: magnetic closure pull-force 6–50 g at 2,800 Gauss, greyboard range 1.5–3.0 mm, foil palette seventeen colours in-house, MOQ 200+, lead times 7–10 day sample / 15–20 day production, four factories, founded 1992