Sunglasses holder strap size: eyewear retainers are made of comfortable polyester cord, straps are approx. 23.6 inches/ 60 cm in length and 5 mm in thickness Adjustable design: the eyeglass strap is designed with adjustable buckle, straps will not easily fall off and are comfortable for most head sizes and shapes Polyester Sports,Chain 3 Colors for choosing: the sunglasses holder chains have 3 colors, black, blue and red, various colors can easily match with your different clothes Wide application: eyeglasses neck cords are suitable for men, women, adults and children, use it in sports or other outdoor activities, can fix your eyeglasses well Quantity: 6 pieces of eyeglass straps and 2 pieces of glasses cleaning cloth, the color of the glasses cloth is in random delivery