Material/size:21in，High quality and comfortable HAS MANY USES:Our lanyards are versatile and can be used as masks or glasses,Effectively reduce the pain and pressure of wearing masks and glasses for a long time, and wear them in the most comfortable state. SUITABLE FOR ALL MASK-provides convenient access to your face mask at all times Keep Your Mask Safely Around Your Neck When Not in Use! There is no need to worry about losing or breaking your face mask. SUITABLE FOR ALL GLASSES - From small to large frames, these eyeglass chains and cords for men and women strap provide universal compatibility fitting optical frames, reading glass es & sunglasses.There is no need to worry about losing or breaking your glasses. SUITABLE FOR ALL-there are many different colors, you can match different clothes.strap is anti-skid sturdy and durable, not easily damaged.