Reclosable Fastener, Disc, Rubber Adhesive, 4 in, Black, 10 PKMfr #: SJ3541 Black, interlocking mushroom shaped heads (400 stem density per square inch) provide strong, reliable and durable fastening that can be opened and closed multiple times Synthetic rubber based adhesive bonds well to a variety of substrates including low surface energy plastics such as polyethylene and polypropylene Strong fastener secures with an audible snap, verifying closure An alternative to screws and bolts, this hidden fastener