Premium Quality: the strap loop is made of high quality 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. 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.