Dear customer, Thank you for choosing our products. If there is any problem with our products, please contact us through the order information. We will be happy to serve you and solve it for you as soon as possible within 12 hours, thank you Nice performance: the elastic material is thick and durable which can keep the hair firmly and not easy to loosen, easy to put on and take off without tangling, snagging or pulling Comfortable to use: With a soft and strong seamless design, easy to remove from the head without any sticking to the hair Good for thick hair: these metal-free elastic bands with good elasticity are good for medium to thick hair, don't worry about your thick hair Abundant quantity: comes with 100 pieces of metal-free black elastic bands, enough for your daily use or sharing with friends Headband size: average size is about 8mm in thickness and 4cm in diameter, common use size in daily life