1" x 150' Black 3M SJ3542 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. Type 170 stem density mates to types 250 or 400 but not to itself. 150 feet of usable product. Does not interlock with itself. Designed to bond to many plastics, powder coated paints and other low surface energy materials. Indoor use in temperatures up to 120 degrees F. Stems interlock with DK3M115 or DK3M128.