The technical self-adhesive hook and loop fastener 3M Dual-Lock SJ3870 is composed of mushroom-shaped heads and acrylic adhesive on the back of a black polypropylene reclosable fastening system. Acrylic adhesive adheres to many plastics, powder coatings, and materials with high and medium surface energy, with little or no surface preparation. This product can be used indoors and outdoors in a wide range of applications; it is ideal for example. for mounting flexible solar panels, ceilings, access panels, signs, and exhibits. Allows connection with medium-density header type for higher joint strength or with high-density header type for high joint strength. Withstands up to 1000 cycles of connection and disconnection.