Dual Lock SJ3550 self-mating adhesive pads, pack of 16 pieces (8 pairs) adhesive circle pads (each 23 mm diameter). On one side white, acrylic adhesive foam (protected by a removable, film liner) that bonds strongly to a variety of surfaces including metals, glass and plastics. On the other side black, interlocking mushroom shaped stems that will snap together with another piece to form a strong fixing and fastening that can be opened and closed multiple times. Strong fastener secures with an audible snap, verifying closure. This fastening process creates a durable attachment and provides fast product assembly with great design flexibility. Mushroom head closure also reduces vibration. Ideal for indoor and outdoor use to attach doors, access panels, cushions, headliners, signs and display components. Multi-purpose for the ultimate convenience where a high strength and versatile reclosable fastening system is required. An alternative to screws and bolts, this hidden fastener provides a snug fit and smooth aesthetic appearance. No need for any drilling, screwing or sewing tools which makes for quick installation.