Our handmade charms are made of high quality non-toxic waterproof PVC rubber material that will likely outlast the shoes you put them on. The anchor is made of ABS plastic which will not fall out easily while perfectly get the button through the hole. These charms are compatible with Crocs, most major off brand clogs and shoe charm wristbands They can also be used with shoe lace adapters to wear on regular sneakers or shoes with laces Made in USA!The second picture is an example of the backThe third picture is the approximate size compared to a US Quarter Veteran Owned Business - 10% of our profit is donated to Tunnel to Towers.Org