Improved Cut, 60mm Rotary Cutter Blades, 10 Pack THE SECRET - The secret behind the sharpness is 4 individual sharpening stages so you get a flawless cut every time. LASTS LONGER - Made from high-quality Carbon steel SKS-7 so that you can use each blade again and again with minimum dulling. Fits your rotary cutter - compatible with ALL rotary cutters including Fiskars & Olfa. 100% money back - if you're not happy for ANY reason, we encourage you to get your money back :)