Premium Quality: : the strap loop is made of silicone rubber with good elasticity. The metal ring is longer than others, thus can hold tighter on your glasses. Flexible and durable. .Quality Materials: : Eyeglass chain ends are made of high-quality silicone and stainless steel, soft and durable, anti-oxidation will not rust, can be close to the skin, providing you with a perfect use experience. .Silicon .Perfect Size: : Adjustable rubber ends connectors is about 20 mm long and 5 mm wide, is a universal size, suitable for most eyeglass chains. .Adjustable and Comfortable: : The wearer can move the metal coil to adjust the grip of their glasses, sliding up to lock, sliding down to unlock, providing you with a comfortable experience. .Widely Applications: : Eyeglass chain strap ends are suitable for any craft project that requires a fixed ring. It is a necessary accessory for various glasses, such as sunglasses chains, sports glasses belts, etc., providing you with many convenien . Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.