Decoden Supplies: What Actually Goes on a Phone Case

1. Flatback is the requirement, not a preference

Decoden works by gluing pieces onto a curved surface, usually over a whipped-cream base. A piece with a flat reverse side sits flush and bonds across its whole footprint. A rounded or 3D piece touches the glue at one point, sticks out, and is the first thing to catch on a pocket and pop off.

That is why the useful phrase when sourcing is “flatback cabochon” rather than “charm”. Charm often implies a drilled hole and a jump ring — useful for keychains, wrong for a case. Our resin line is described as flatback for exactly this reason, and the pieces that are drilled are listed separately for jewellery and keychain use.

2. The size mix that makes a case look finished

Beginners buy one size and wonder why the result looks like a sticker sheet. A case that reads as a composition uses three tiers, and our stock sizes map onto them:

Filler pieces are where most of the count goes, which is exactly why 100pcs bags suit this craft — one bag of small pieces covers many cases, while you only need a handful of focal pieces per design.

3. Why detail drifts between batches — and what to do

Cast resin is the right process for these shapes, but it has a physical limit worth understanding before you order at scale. Mixing the two parts causes an exothermic reaction that generates heat, and that heat plus the casting compounds gradually degrade the mould — a flexible mould typically yields between 25 and 100 castings before fine detail softens.

Practical consequences:

• Judge highly detailed designs from a current-batch sample, not from a listing photo that may have been shot from the first pull off a fresh mould.
• Expect minor variation on reorders of intricate pieces. On simple geometric shapes it is negligible; on a detailed animal face it is visible if you line up two batches.
• Custom shapes are quoted per project because a bespoke design means new tooling that wears out — it is not an artwork fee.

4. Resin or clay on a case?

Both materials turn up in decoden supplies and they are not interchangeable. Polymer clay is PVC-based and cured at around 129–135 °C, which is why clay slices arrive as fully hardened pieces with the pattern running right through them. Cast resin takes finer moulded detail and a glossier finish.

On a phone case the practical split is: resin for the focal and mid pieces where moulded detail is the selling point, and clay slices for scatter and gap-filling where you want pattern and colour without paying for detail nobody will look at closely. Mixing both is normal — most finished cases in our reference photos use resin shapes over a clay-slice confetti layer.

5. What sells, by buyer

Decoden buyers split into three groups, and they want different things from the same catalogue. Kawaii food pieces — jelly beans, strawberries, cookies, cake slices — are the steady sellers for case makers. Ocean and animal sets (crabs, starfish, dolphins, frogs) move for kids' channels and summer ranges. Seasonal shapes carry a short, sharp window: order Christmas pieces a season early, because a decoden case takes hours to build and sellers buy the supplies long before the gift rush.

One useful note for kids' channels: everything here is decorative and non-edible, and must be labelled that way. If you sell into retailers that ask for paperwork, batch test reports for EN 71, ASTM F963, CPC and REACH are available on request — our safety labeling guide covers the wording that keeps you out of trouble.

6. A starter range in one order

You can build a working decoden range without a bulk commitment. Sixteen of our 19 resin designs have a one-bag minimum (three are two bags), and most pack 100pcs. A sensible first order is:

• 1–2 focal designs in the 30 mm-plus band, matched to one theme;
• 2–3 mid-size designs that carry the same theme;
• 1–2 small filler designs — these get used fastest, so buy the deepest here;
• plus whipped-cream base and glue from your local supplier, which are cheaper to source domestically than to freight.

That is five to seven bags. It photographs as a coherent range, it leaves budget to reorder the fillers you burn through, and it tells you which theme to go deep on before you spend on bulk.

Get a decoden starter range quoted

Send the theme and roughly how many cases per month. We put together a focal / mid / filler mix from stock, quote by the bag with carton data, and can send current-batch samples on the detailed pieces before you commit.

Request a decoden supply quote →