Shell Disc Buttons are made from Fresh water Clam. Used as a traditional adornment throughout much of North America for Clothing, Necklaces, Earrings, Buttons, Broaches, etc. The profiles and colors match and follow the natural curvatures of the Shell. Therefor, each Button will be unique in its size, appearance and color. 2 holes pre drilled for attaching, or using as decorating. Like all things in Nature, no two will be identical, but I would try my best to match similar, at your request.