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. - 3M loop fastener SJ3533 is coated on the backside with a medium tacky synthetic rubber pressure sensitive adhesive designed to function for indoor applications. It is especially suited for indoor attachment to low surface energy materials such as polyethylene and polypropylene plastics.