Original 3M Dual-Lock SJ3560 Type 250 Clear Recloseable Fastener offers advanced closure alternatives to zippers, screws, snaps, hooks, bolts and more. Used on EZPass transponders and other toll pass. It offers greater design flexibility, faster product assembly, smoother and cleaner exterior surfaces and improved product performance in many applications. It consists of tiny mushroom heads that lock into each other. Open and close easily by simply pulling the interlocking strips apart. The adhesive attaches to metal, plastic, and most rigid or flexible surfaces. Resists solvents and moisture. Also resists heat up to 200 degrees. 1/2" wide x 6' long roll. Type 250 (approximately 250 stems per square inch).