Color: Black Contents: Set of 10 pairs Material: 100% Synthetic Fiber (Silicone) [Set of 10 & Applicable Eyeglass Types] Black eyeglass locks, a set of 10 pairs (20 pieces), are included for convenient replacement. Designed to fit frame arm sizes of 0.6-1.2cm wide. [Securely Fix Glasses!] The anti-slip holder reduces slippage of eyeglasses and prevents them from falling off the ears. It solves the problems of glasses repeatedly sliding down the nose, wobbling during exercise, and discomfort from wearing them for long periods! By securing the glasses, you can firmly fix them, making them the perfect item to prevent slippage. It eliminates discomfort and danger when glasses slip during sports or work, improving exercise and work efficiency. [Discreet & Comfortable] You can only see the eyeglass hooks from the back, and you can use them as many times as you like. The eyeglass locks are hidden behind the ears and have a discreet design. Using this type of eyeglass retainer, the holder will not discolor or deform. Also, it is made of soft and elastic material, so you don't have to worry about your ears hurting. The slightly curved design is more ergonomic and comfortable even when worn for long periods. [Wide Range of Uses] It can securely fix glasses, so they are unlikely to fall off even during intense exercise. You can be satisfied with both daily life and sports, such as tennis, soccer, baseball, golf, sports, cycling, running, mountain climbing, and skiing. & Usually, you can use them for about 2 months in summer and 3-4 months in winter. It is recommended to replace them about once a month if you sweat a lot.