The patented SUPERGRIP™ System is a simple but effective way to hold rigid signs firmly in place. This technology is then used in conjunction with a variety of mounting options to provide an extensive range of cost-effective display solutions. Manufactured from co-extruded PVC.*** This Flexi Sign Holder with Supergrip? mounting is suitable for a 6mm Shelf and accepts material upto 1mm thick, Dimensions 75 x 19 x 21.