[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 convenienProducts from ChunChuan's store