Adjustable to 33.5" Long, Polypropylene Composition, Threads Through Eyelets on Binoculars. This is a direct factory replacement for the polypropylene Neck Strap that came with the purchase of a Swarovski CL 8x25 or 10x25 Pocket Binocular. It is adjustable to a maximum of 33.5 long and connects to your binocular through the strap eyelets on either side of the binocular.