Easy to take on, off and adjust. Great to hold glasses in place on your nose without them sliding down! These glasses ear hook grips are so lightweight and comfortable that you will forget your glasses are there. The eyeglass holders are made from skin-friendly silicone, non-toxic, odorless, soft, pliable, flexible, and durable. The black colour makes them more discreet, unobtrusive. Hole Dimensions: 6 mm (length) x 2 mm (width). NOTE: Please confirm this size is suitable for your glasses before ordering. Not recommended for glasses with thin metal arms. Anti-slip glasses ear hooks fit most eyeglasses, reading glasses, sunglasses, and more. Ideal for running, sports, working out, and other activities. Packaging: 3 pairs of silicone anti-slip eyeglasses retainers.