The basics VELCRO® Brand Sticky-Back Industrial-Strength Coins. The benefits Industrial strength. 50% stronger than traditional VELCRO®. The hook side is molded plastic rather than woven. The adhesive is waterproof.  The uses Great for all types of indoor and outdoor projects which require a superior strength or waterproof fastener. The bottom line These VELCRO® Sticky-Back Coins are 1 7/8" and come 4 pairs in a package. Sold in Black or White.