3/4" x 150' Black 3M SJ3540 Dual Lock™ Fasteners. Fastens heavy items creating a more permanent bond. Rigid plastic stems interlock for hundreds of closures. Rubber based adhesive on back of a polypropylene, reclosable fastener. 75 feet of usable product. Designed to bond to many plastics, powder coated paints and other low surface energy materials. Indoor use in temperatures up to 120 degrees F.