3M SJ3419F black reclosable fastener comes in a 3/4 in width, 50 yd length and is packaged 16 per case. These products are generally considered "hook & loop" products. While the traditional system is that of a hook and a loop, some of these products also use an interlocking mushroom like head. This particular 3M item is the hook & loop side. This is a non-adhesive based reclosable fastener. In addition to the other properties this product is heat resistant.