Natuworld 12pcs Black/Colorful Sport Safety Eyewear Nylon Cord Reading Glass Neck Strap Eyeglass Holder Lanyard Glasses Accessories for Women Men Boys Girls and Students Cords Material : Nylon Cord lenght: 60cm/23.60 inch Color: Black/ Colorful are available(depend on your choice) Cords width: 2.5mm/0.098 inch, Weight: 25g Suitable for: optical frames, reading glasses, sunglasses.etc