yueton 3pcs Sport Safety Anti-slide Thickness Adjustable Sunglasses Universal Fit Rope Eyewear Retainer Strap Eyeglasses Cord Lanyard Holder Glasses Accessories Thinckness nylon cord: 4mm diameter;total length:60cm;folded in half: 30cm Perfect to keep your sunglasses in place everywhere you go. Fit most styles of eyewear with rubber connectors. Fully adjustable with plastic slider Anti-slide and thickness design for more durable