3M™ Loop Fastener SJ3533N is one part of a two-part fastener solution designed to provide great durability for thousands of closures. With its medium tack rubber-based pressure sensitive adhesive backing, this fastener allows for easy and convenient attachment to a variety of substrates, including plastics. Delivers Durability 3M™ Loop Fastener SJ3533N is our better performing rubber-based loop fastener with a 3 mil (0.08 mm) polyethylene film liner. It is an attachment alternative to a wide variety of closures, including zippers, screws, snaps, hooks and more. We designed this fastener with a woven loop backing, covered with thousands of soft, pliable napped loops, providing for thousands of openings and closings (cycles). Commonly paired with 3M™ Hook Fastener SJ3532N, this loop fastener can also engage with other 3M™ Hook Fasteners. To ensure stability and flatness, both the hook and the corresponding loop are preshrunk.