[name] non-slip glasses chain [material] metal [foot cover material] silicone [color] silver [length] about 75cm does not include the two heads; Due to handmade, there will be 1 - 3cm error. Be careful shooting! [weight] about 15 grams [features] high-quality non-slip glasses chain, fine workmanship, comfort and safety, good plating texture, cover the tail of the glasses foot, prevent the glasses from slipping when you are doing sports, suitable for all kinds of glasses and clothes, feel free to take the glasses off the chest, whether it is for sports, outings or banquets , it is the glasses speed beat of your heart. [method of use] first put the rubber traps at both ends of the glasses chain on the leg, then use the metal on the rubber ring to press the leg and fix it. Usage: just remove the silicone and loop the opening circle on the mask rope < p>Anti-drop mask lanyard lanyard around the neck mask hanging lanyard Durable type mask lanyard, can be ear-proof, anti-drop many people when worn immediately , empty when removed, breathe cooler air up to 70cm long. Control the height of the mask on the chest