[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. 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