Super stretchy design makes our product extra strong and durable. Intended use is orthodontics, braces, tooth gap, and rubber bands can also be used for hair braids, pony tails, knots, etc. Safe medical grade material for sensitive patients. Feature - Material: Rubber. - Size: 0.65x0.65x0.1cm. - Super stretchy design makes our product extra strong and durable. - Intended use is orthodontics, braces, tooth gap, and rubber bands can also be used for hair braids, pony tails, knots, etc. - Safe medical grade material for sensitive patients. - Every package is checked to assure all cuts are consistent and that the forces are correct. - 10 packs, each pack contains 100 pieces rubber bands, which is enough for your daily use.