3M Dual Lock SJ3560 Type 250 Clear Reclosable Fastener offers advanced closure alternatives to zippers, screws, snaps, hooks, bolts and more. It offers greater design flexibility, faster product assembly, smoother and cleaner exterior surfaces and improved product performance in many applications. The fastener consists of continuous polyolefin strips with polyolefin stems having a mushroom shaped top. The mushroom heads allow the fasteners to easily slide over each other allowing positioning of parts before they are snapped together creating a firm fastening attachment. Open and close instantly by simply pulling the interlocking strips apart. The adhesive attaches to metal, plastic, and most rigid or flexible surfaces. Resists solvents, moisture and plasticizers. Also resists heat up to 200 degrees. 1" wide x 6 long roll. Type 250 (approximately 250 stems per square inch)