3M(TM) Dual Lock(TM) Reclosable Fastener SJ3550CF is a general purpose acrylic adhesive on the back of a black, polypropylene reclosable fastner. 3M(TM) Dual Lock(TM) Reclosable Fastener SJ3550CF has 250 stems per square inch with an 0.23 inch engaged thickness. Offers a closure life of 1,000. 3M(TM) Dual Lock(TM) Reclosable Fastener SJ3550CF has a high temperature performance of up 200 degrees fahrenheit and can be used indoors and outdoors. 3M(TM) Dual Lock(TM) Reclosable Fastener SJ3550CF is for use with metals (aluminum, stainless steel), glass and high surface energy plastics (acrylic, polycarbonate, ABS) and can be opened and closed 1,000 times.