Elastic Adjustable Metal: Our bodbop hair band is made of rustproof waterproof metal, very sturdy, hard to be broken. It's highly elastic. Can be bent and adjusted easily by hand to be smaller or bigger, make it more suitable and comfortable for your head Non Slip Design: The metal headband has many wavy teeth, so it has good grip to make sure the hair band won't slip down, hold hair non slip. Every headband has 2 protective covers on 2 sides, make it safer and more comfortable