Bullion storage boxes for silver coins, bars and cards

The shell has a full perimeter gasket and closes on lockable latches, so it's sealed against damp, dust and splashes, which is why we chose it over a display box. Treat it as protection against a leaking loft or a damp garage, not as diving equipment.

A durable 3D-printing filament, chosen to hold a clean edge and take a knock without cracking. Every insert is printed to order rather than moulded. That's what lets us cut them to a specific format and run them in whatever colour you want.

Every box lists its slot sizes, on its page and in the builder, and our size guide lists popular coins with which fit. The sizes are the openings as designed, so measure the widest point of your piece, capsule or sleeve included, and it needs to come in a little under them to slide in.

Coins: each slot takes a round piece up to 45.5 mm across and 7.3 mm thick, sitting on edge in a curved cradle. That covers most 1oz bullion coins in their capsules. Silver Eagles and Kangaroos (40.6 mm) fit bare, but the 41 mm capsules usually sold for them are about 47 mm across, too wide for the slots, and they're too big for our own 40 mm capsules.

Bars: slots are 38 mm wide and 8 mm thick, open through the middle with foam either side, so a thicker bar and a thinner one both close in properly. That's deliberate: bar dimensions vary between mints, and the foam takes up the difference.

Cards: slots are 90 mm long and 2 mm thick, long enough for a card bar still in its plastic sleeve, as well as a bare one. Larger Royal Mint cards are too big for them, in the Credit Card 98 and the Multibox alike.

TEP cards: slots are 84 mm long and 5 mm thick, for cards still sealed in their tamper-evident packaging.

Storing something unusual, such as slabbed grades, oversized capsules or an odd format? Message us with the exact product first. We'd rather cut you a custom insert than sell you one that won't close.

Usually, yes. Because each insert is printed to order we can run other filament colours. Message us before you buy so we can confirm stock and any lead time.

A flat £5 per box, however long the text, and it adds 2 working days to the lead time. Add it in the builder and we'll come back with the layout for approval before printing. Keep it short: around 20 characters reads best across the front of the insert. Because an engraved box is made to your specification, it can't be cancelled or returned once printing starts unless it's faulty.

Delivery is free anywhere in Great Britain, including the Scottish islands, sent by Royal Mail 48, normally with you within two to three working days of dispatch. We can't currently deliver to Northern Ireland, the Isle of Man, the Channel Islands or overseas. We dispatch standard configurations within 2 working days. Engraving adds 2 working days, and the 1g Multipack 117 takes 4; the builder shows the exact date range as you configure. Collection is welcome from Milton Keynes.

Dry, sealed and handled as little as possible: coins in capsules or their original packaging, inside a gasket-sealed case with a silica gel sachet, kept somewhere with a steady temperature rather than a loft or garage. Avoid soft PVC flips, rubber bands and cardboard, which can mark silver over time. Our guide to storing silver at home covers it in full.

No. We make the storage, not the metal. The coins and bars in our photos are there to show fit.