250 sq. inch and 0.23 inch 1000 coefficient thickness of 1000 stems and 3M Scotch SJ3550 dual lock 250 reclosable zippers are universal black reclosable zippers. This black zipper has a white stem mushroom shape on a polypropylene collared coated with a universal acrylic adhesive. 250 Stem Density Fasteners Can Be Matched To Input 170, 250 or 400 Fasteners (More Closed Strength Than Higher Total) The mushroom shape creates a 5 times greater closure strength than the same hook and loop on the other side of the stem and zipper interlock on the other. Dual Lock Type 250 fasteners are designed to bond metal, glass, and medium to high surface energy plastics and paints. They can replace traditional fasteners such as screws, clips, rivets, snaps, hook and loop and bolts in many applications that require access or relocation. Used to connect doors, access panels, signs, cushions, wall headliners, display components, city bath lighting fixtures, ceiling mounts, privacy curtain rails, sun roof trim and wall panels Also for attaching E-ZPass tags to your vehicles windshield for POP, trade show exhibitions and electronics. Dual lock only has one type on the side. Unlike other hook and loop surfaces The 10 foot roll will be used as two 5 foot strips, typically cut in half and then cross or connected rolls are so seriously. Polypropylene - Adhesive: Acrylic (300 LSE) - Release Liner: Clear Polyolefin Film - Thickness: 140 mils (carrier, adhesive) 4 mils (liner) - Service/Operating Temperature: Max Back/Carrier - Made in USA Technical Information 200F - Working Thickness: 230 mils - Pin: 250 per square inch