Velcro Sticky Back squares. Translucent, easy-to-use. For indoor and outdoor use. Water resistant. Adheres to most surfaces, including glass. Simply peel tape from fastener and press firmly onto a clean, dry surface. Adhesive reaches maximum strength after 24 hours. Not recommended for fabrics, sewing, dashboards, flexible vinyl, or underwater use. Continued exposure to full sunlight can damage fastener. Includes 12 sets of 7/8" squares.