Strong double-sided tape with nano-grip technology. Works like millions of microscopic suction cups that hold tight! Waterproof to use indoors or outdoors on glass, brick, wood and more! Reusable with no residue—just pull to release the suction, remove and rinse. Holds up to 17.5 lbs. Pack of 96 pre-cut pieces (48 each: 1" sq. and 1.5" x 2").