Adjustable Anti-Slip Silicone Ring: This glasses chain buckle features a movable silicone ring that firmly grips your eyeglasses legs, preventing slippage and ensuring your eyewear stays securely in place during daily use with eyeglass holders and spectacle cords Durable Wear-Resistant Material: Made from wearproof silicone, this eyeglass chain accessory is easy to install and provides a reliable connection between your glasses chain and eyeglass legs for enhanced stability Universal Compatibility with Spectacle Accessories: Designed to fit a wide range of eyeglasses chains and spectacle legs, this adjustable buckle improves the secure fit of your eyewear, compatible with various eyeglass cords and holders Compact Lightweight Design for Comfortable Wear: Measuring approximately 0.83 x 0.28 x 0.08 inches, this small glasses rope accessory adds minimal bulk and maintains natural comfort when used with your eyeglass chains and cords Customisable Eyewear Accessory for Personalised Fit: the adjustable silicone ring allows you to tailor the grip on your glasses chain, enhancing the performance and stability of your spectacle cords while providing a customised accessory