What you get: 40pcs rubber cord ends. White silicone rubber strap end with nickle plated steel metal ring. Adjustable: The adjustable silver strap end allows you to get the proper grip on your glasses. Just move the metal ring to adjust the tightness on your glasses temples. Premium Quality: the strap loop is made of high quality silicone rubber with good elasticity. The metal ring is around 8 coils. longer than others. thus can hold tighter on your glasses. Flexible and durable. Size: 22x5mm/0.87x1.96 inch. Metal ring length: 6mm/2.36inch Ideal for: easy to use. good accessories for eyeglass chain to prevent from losing.