Thank you for viewing! These are hair ties for babies and kids! The rubber bands can be replaced if they break. Because they are handmade, there may be some air bubbles, burrs, unevenness, bumps, or dust. Also, they are not as strong as mass-produced items. Thank you for your understanding. We offer discounts for multiple purchases! 50 yen off for each item after the first! Size: 2.5 x 2.5 cm Rubber band size: 2.5 mm, 3.5 cm diameter Please see my profile before purchasing! Thank you!