With a mushroom headed snap fastening and a modified acrylic adhesive on the back of its polypropylene construction, the 3M SJ3870 Dual Lock Re-closable Fastening Tape can be fastened and refastened up to 1000 times before losing 50% of its original tensile strength which is up to 5 times the strength of typical hook and loop fasteners. Strong and resilient, the 3M SJ3870 Dual Lock can be used on a variety of surfaces, both indoor and outdoor. When fastened the tape gives a smooth clean attachment for a seamless appearance. You'll know when the connection is secure thanks to the audible "snap" of the connection heads and can be used in place of screws to create secure and lasting bonds in next to no time. Features and Benefits General purpose acrylic adhesive bonds to medium to high surface energy substrates (e.g. metal, ABS) Stem density: 250 stems/in Closure cycle life can be fastened up to 1000 times before losing 50% of tensile strength Mushroom shaped stems engage through