1.Collect coins of different diameters with a single system. 2.For all coins from 16 40mm diameter. 3.Capsules with precise-fit black foam insert Optimal protection for your coins , scratch resistant plastic. 4.Secure and easy-to-open lock. Specification: Material: Acrylic, Foam Color: Clear Type: small square box for coin storage. Color: square box, padding white by default. Size Chart: No. 1 Inner pad: 16/21/26/31/36mm. No. 2 Inner pad: 17/22/27/32/37mm. No. 3 Inner pad: 18/23/28/33/38mm. No. 4 Inner pad: 19/24/29/34/39mm. No. 5 Inner pad: 20/25/30/35/40mm. Package Includes: 20X small square box for coin storage Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.