Rubber... approximately 4mm in thickness, approximately 57mm in inner diameter, black Ball... approximately 15mm in size Handmade hair tie. Made using cat's eye beads, woven into a ball shape. Cat's eye beads change color when tilted, giving off a beautiful sheen. This is a basic and simple weaving technique, but the finished product becomes luxurious depending on the beads used. It will also stand out in your hair! I think you can use it for everyday wear or at work without being too flashy. It is listed as new and unused, but please understand that it is handmade. I would appreciate it if you could understand that it is a amateur work. #SimpleHairTie #HandmadeHairTie #RoundBall #Cat'sEye