Twinpack. SJ355D Reclosable Fastening System. More than 1000 openings and closings. Five times the strength of conventional hook and loop fasteners. Coated with VHB acrylic foam tape for indoor and outdoor applications. Ony 1 product: locks onto itself. As authorised distributor for 3M, Directa can help you with any of the Dual lock range, please click below to see the information sheet or call 01621 827312 for any help with ordering your products online.