• Size: Length 1.2 x 0.6 x 0.2 inches (3.0 x 1.5 x 0.5 cm); Weight: Approx. 0.04 oz (1 g); Material: Silicone; Country of Origin: Japan; Accessories: Adjuster included; Special case included; Mode: High quality silicone; Uses multi-adjuster • Lock your glasses firmly behind your ears. Made of good quality silicone. It stretches well and fits most glasses and sunglasses, and can be removed if needed. It comes with an adjuster so it can be used even with thick and narrow lines. Convenient holder for carrying • Holds glasses securely. This eyeglass lock prevents glass from slipping or falling off your nose during intense exercise. Comfortable to wear without having to push it back! • Made of soft, stretchy and safe silicone material that is safe for your skin. Soft, comfortable, high elasticity, no cracking. Fits glasses in place. It won't hurt even after long use. Rubber strands reduce snagging • Hasegawa Bico develops and manufactures "Glasses’ products that are not found anywhere in the world." We aim to enjoy a comfortable glasses life through Japan-made products for peace of mind