The cutter protection strip is one of the most important parts on the cutter. It allows for straight and true cuts without any jagged edges or ruined material. The cutting strip is the white strip under the blade that runs the length of the cutter. Worn cutting strips cause inconsistent cutting; unclean cuts, and premature blade wear. For the best cutting results, replace the cutting strip every six months and it is always a good idea to have one as a back-up. Compatible with the R24 and R31 VE Vinyl Cutters.