Koa (Acacia wood) with solid *bone. SIZE: 5.0cm (50mm) 1.97 inches (size may vary slightly) *All bone and Horn used is derived from domesticated bovine (beef or water buffalo) and is a by- product of the meat industry. I do not use or condone the use of materials derived from wild or endangered animals. We put this on a one size fits all cord with sliding slip knots for adjusting either short or long. Upon request, I will put yours on a fixed length cord with a toggle and loop closure. Item is presented in a gift pouch that includes information about the piece and its meaning. Items are made by me and a member of my shop. I do custom/finishing work, cording, binding/lashing.