1" x 150' Black (1 Pack) 3M SJ3541 Dual Lock™ Fasteners. Fastens heavy items creating a more permanent bond. Rigid plastic stems interlock for hundreds of closures._x000D_ Rubber based adhesive on back of a polypropylene, reclosable fastener._x000D_ Type 400 stem density mates to types 170 or 250 but not to itself._x000D_ 150 feet of usable product. Does not interlock with itself._x000D_ Designed to bond to many plastics, powder coated paints and other low surface energy materials._x000D_ Indoor use in temperatures up to 120 degrees F._x000D_ Stems interlock with DK3M122 or DK3M127.