Features:1.SIZE:The end of the eyeglass chain is 20 x 5mmL*W),universal size for most eyeglasses chains.50 pieces eyeglasses strap ends enough for your demands in daily life.2.Adjustable and Anti-Slip:Metal coil can be moved by wearer to adjust the eyeglasses,which can help you adjust the grip of the glasses, you can adjust the metal coil on the ends to fit your glasses leg.Move the metal coil hoop that sliding up means lock and sliding down means unlock.Rubber ring will make the chain stable on your glasses and have effect on non slip.3.Quality Material:These spectacle end connectorsare mainly made of quality soft silicone and durable metal,flexible and easy to use,providing long servicing life,which can offer you nice use experience.4.Wide Application:This type of silicone ring is an accessory for glasses chain,which can connects glasses chain with your glasses leg.These designed glasses accessories are very useful item in your daily life,which can prevent your eyeglasses from accidentally falling or losing and can be worn with your clothes to present a variety of styles.Also great for any handcrafts objects that require end loops and stationary hoops,such as a decoration for sunglasses and sports eyeglasses strap.