A cutting blade, a knife of a roller knife, rotary cutter will last a long time under normal use.
But of course they don't have eternal life unfortunately. That is why we sell spare blades for all our knives, large or small. Each but several packs contain several spare sheets. We also sell replacement blades for the luxury knurled knives and wavy blades!
We supply both Prym, Olfa and Clover, they are of the same excellent quality; you cannot specify a choice with your order.
