Upgraded Version Feature: Eyeglass Chain Connector, the metal ring spring extension Upgraded Version design on silicone ring, allow to adjust the tightness of eyeglasses chain ends to get the proper grip. you just slide up to lock or slide down to unlock for fitting your eyeglass leg, not easy to fall off, connecting the glasses and the glasses chain effectively. Specifications: Material: silicone, metal Size: Eyeglass chain ends: 0.78 inch long Lobster clasps: 0.47 mm long Color: gold and silver Package includes: 50 PCS black silicone glasses rings, with silver metal loop spring 50 PCS black silicone glasses rings, with gold metal loop spring 50 PCS white silicone glasses rings, with silver metal loop spring 50 PCS white silicone glasses rings, with gold metal loop spring 50 x silver Lobster clasps 50 x gold color Lobster clasps