The QUADRUM Mini coin capsules not only save space, they also offer all the advantages of the QUADRUM system: As square capsules are all the same size (38 x 38 x 6.4 mm / 1 1/2 x 1 1/2 x 1/4″), you can store coins of all sizes in one collection system – that applies for coins with a diameter of 10 mm (3/8″) up to 29 mm (1 1/8″).