The elastic hair bands are soft and elastic, the inner part is an elastic rubber thread, and the outer part wrapped with a soft nylon textile thread to protect the rubber band from breaking when pulled hard, no metal hair band will not tangle your hair, easily stretched and restored to shape. The 4mm hair ties are stretchable and no slipping, suitable for thin to medium thick short, long, curly hair, great for DIY various hairstyles for girls, women and men. These hair bands can hold the ponytail tightly during working, exercise and entertainment, easy to put on and remove, also can be used to DIY some bow knot, lace band etc, mean while can use the rubber bands to tie the package bags.