This roll is hook (rough) side only. More versatile than mounting tape, VELCRO Brand tape allows items to be fastened and unfastened; reposition easily vs permanent tape. Bonds to a variety of substrates including Acrylic, Aluminum, Copper, Glass, Nylon, Stainless Steel, PVC, PET, Polyester, Polystyrene. It is very important that all surfaces be thoroughly cleaned before applying VELCRO® Brand Adhesives. Apply initially at room temperature for best results, or warm substrate in cooler conditions. Suitable for larger projects in the shop, office or classroom, VELCRO Brand tape is perfect for mounting white boards, first aid kits, tool boxes, signs and more. 75ft roll, cut strips to length. High cycle life, VELCRO Brand woven nylon material is designed for high cycle life and suitable for applications that require durability, long life and consistent performance.