Fitted foam inserts give dice separate positions, with pocket shapes and depths developed around the actual components supplied for the project. A seven-piece polyhedral layout can include d4, d6, d8, d10, a percentile die, d12 and d20, with each position checked individually. Foam thickness, the backing layer and lid clearance must work together so the tin closes without forcing pressure onto exposed corners. Hinged and lift-off lids offer different access arrangements; optional window lids can be reviewed for retail display and the selected tin structure. Jinyu’s custom projects start from 5,000 pieces, with tin dimensions, foam specifications, artwork and the supply scope confirmed before bulk production.