Clear, interlocking mushroom-shaped heads (250 stem density per square inch) provide strong, reliable and durable fastening that can be opened and closed multiple times. Strong fastener secures with an audible snap, verifying closure. Clear, acrylic, tape bonds well to a variety of substrates including metals, glass and plastics such as acrylics, polycarbonate and ABS. 100 1.5" x 0.5" 3M strips.