3M™ Scotchmate™ reclosable fasteners consist of two strips of fabric which mate together with light finger pressure. The hook strip is covered with tiny, stiff hooks, about 300 hooks per square inch (46/sq. cm.). The loop strip is covered with thousands of soft, pliable loops. When pressed together by hand, the hooks and loops mate to form a secure fastening attachment. Simply pull the strips apart by hand to unfasten. These Scotchmate hook and loop fasteners are made of 100% nylon. They are preshrunk to provide dimensional stability and flatness.