Uhome 12/LOT Colorful Elastic Adjustable Reading Glasses Eyewear Eyeglass Cord Neck Strap Rope Double Color Kids Eyeglass Rope Cord Chains Holder Cords Material : nylon with rubber band inside Color: Mixed by 12 different colors per dozen Cord lenght: 45~50 Cords width: 2.5mm/0.098 inch Weight: 61g