Rubber: Approximately 4mm thick, approximately 5.5mm inside the circle, black Ball: Approximately 15mm in size Handmade hair tie. Made by crocheting Czech round beads to look like a ball. It's a simple basic bead crochet, but the finish becomes gorgeous depending on the beads used. Looks great in your hair! I think you can use it daily or at work without being too flashy. Although it is new and unused, please understand that it is handmade. I would appreciate it if you could understand that it is a handmade item. #BeadAccessories #HandmadeHairTie #Yellow