3M(TM) Dual Lock(TM) Low Profile Reclosable Fastener SJ4580 Clear, 2 in x 50 yd, 1 per case Bulk SJ4580 has a clear, vinyl tape and has 705 stems per square inch (109 stems/cm2) (approximate number of stems). Dual Lock low profile reclosable fasteners can reduce the number of or replace conventional fasteners such as screws, clips, rivets, snaps and bolts in many applications. Consists of continuous plastic strips with stems protruding from a plastic backing with mushroom shaped tops. When two pieces of Dual Lock low profile reclosable fasteners are pressed together, the mushroom heads interlock with one another giving an audible snap, providing a fast reclosable attachment system. To open, simply pull or peel apart.