3M DUAL LOCK RECLOSABLE FASTENER BLACK SJ3541 - Rubber based 720 PSA with Type 400, black foam adhesive and white polyethylene film liner. Temperature and solvent resistant, high shear adhesion, high HSE and LSE. 230 mil engaged thickness and 400 stems per square inch. Roll is 1/2" x 50 yds. Sold by the roll. 4 rolls per case.