REMA TIP TOP's rubber-reinforced, Universal repair units are specially formulated to provide maximum flexibility and strength. These non-directional, center over injury repair units perform flawlessly in both radial or bias-ply tire designs. For best results, always select the corresponding REMA TIP TOP Stem insert unit, carbide cutter and Special Cement BL (non flammable) or Special Blue Cement (flammable) product for a permanent, reliable repair.