Rema Tip Top PN-6 bias-ply (cross-ply) repair units for applications on large-truck. Due to our fully-integrated blue bonding layer, Rema Tip Top bias-ply repair units are suitable for use with all current vulcanizing systems. For best results, always select the corresponding Rema Tip Top Stem-insert unit, carbide cutter, and Special Cement BL (nonflammable) or Special Blue Cement (flammable) for a permanent, reliable repair.