The superior sharpness of these OLFA® blades, coupled with the fact that you can snap off dulled edges, makes them the choice for professionals and do-it-yourselfers alike. Use these blades for construction, including drywall, linoleum, carpet, flooring, insulation, conduit and roofing materials. Good For: Applications such as flooring, drywall and roofing repair or replacment. Cuts carpeting, linoleum, drywall, roofing shingles and more.-High quality, long lasting Japanese steel for durable professional performance-Snap quick and easy for a new sharp cutting edge every time-More cutting edges per blade than traditional 2-sided blades-8 cutting edges/blade-50 blades per pack