These are anti-lost chain end buckle for glasses, made of rubber material, flexible and durable, which can help you to fix the glasses and the anti-lost rope well. It is made of craftsmanship, professional and durable, and can effectively prevent slippage. Features -Color:Assorted Color -Material: Rubber -Size: 2.20X0.60X0.40cm/0.86X0.24X0.16inch -Effectively prevent the loss of eyeglass and provide convenience when wearing glasses for sports. -These eyeglass chain ends can be used together with eyeglass chains to help adjust the holding power. -Can easily adjust the tightness just by moving the button, sliding up means lock, sliding down means unlock. -Can be used as accessories for sunglasses to add a touch of sophisticated and fashionable for daily look. -These eyeglass chain ends are made of rubber, adjustable and flexible, also have a good texture. Package list: eyeglass chain ends