Black, polypropylene reclosable fastener, rubber based pressure sensitive adhesive. 170 stems per square inch. Black foam adhesive and white polyethylene film liner bonds well to high density polypropylene and polyethylene. 230 mil engaged thickness. 3M ™ Dual Lock ™ Reclosable Fasteners have been used extensively in transportation, electronics, business equipment, machinery, medical and sign and display markets. When the mushroom-shaped stems interlock, tensile strength is high enough to repla