The thickness is compatible with regular coins, and it is not suitable for heavy objects such as piefors and ancient coins. Also, please check the diameter of the coin you put in the coin before placing the order as it may cause damage if it is 0.04 inch (1 mm) or the smaller inner diameter. Products that may vary in old money and condition may differ from the size of the catalog. Please measure the diameter and thickness before purchasing. The edges may not fit inside the indicated inner diameter. The total size is just the right size, so if you purchase a 0.0004 inch (0.01 mm) larger coins, you will not fit. Furthermore, even if there is too much space, the coins will move in the capsule, so please be sure to check in advance.