The glasses chain ring is made of flexible and material that fits perfectly around the head and can be modified to secure the eyeglass chain necklace around the head easily. This type of silicone ring is an accessory for glasses chain,which connects glasses chain with your glasses leg. Features - Color: Black. - Material: Silicone. - Size: about 2 x 1 x 0.5cm. - Made of material that fits perfectly around the head and can be modified. - The metal coil can be moved by wearer to adjust the grip on their eyeglasses. - This type of rubber ring is an accessory for glasses chain,which connects glasses chain with your glasses leg. - Silicone ring will make the chain stable on your glasses and have effect on non slip. - With this silicone ring,you can DIY your own glasses and it is durable,wearproof,and easy to install.