Tinksky Eyeglasses Sunglasses Anti Slip Elastic Silicone Strap (Black) 100% brand new and high quality Eyeglasses Sunglasses Glasses Anti-slip Elastic Silicone Headband Strap. Total length: 22cm. (Elastic design allows you to stretch the strap up to 60cm). Prevent your glasses from falling when you are doing sports Material: durable soft elastic silicone. Hole size for glasses legs: 0.9cm*0.2cm. Elastic silicone strap design, make it suitable for both adult and children to wear.