ALL in ONE 3pcs Black Sports Safety Glasses Sunglasses Holder Eyeglasses Neck Cord String Retainer Strap Adjustable Length (3pcs Lot) Quantity: 3pcs Color: black Length of cord: 60cm (23-1/2 inch), adjustable Material: Nylon Suitable for optical frames, reading glasses, sunglasses, prevent your eyeglass from falling when yo