DEDING 6pcs Eyeglasses Sunglasses Glasses Anti-slip Elastic Silicone Headband Strap (6 pcs, coffee) Material: durable soft elastic silicone Total length:53 cm. diameter of the Hole size for glasses legs: 4.4mm Elastic silicone strap design, make it suitable for both adult and children to wear. Installing the anti-slip strap on your glasses legs and wearing it on your head, can effectively prevent your glasses from falling when you are doing sports. colors: 11colors for your more optiions : coffee, black , pink , dark blue, purple, yellow, orange , green, red , light blue , rose red,