(1) High Grade Stainless Steel- Super quality product that is designed to give smooth cut every time you use. (2) Compatibility- These blades fit with almost all rotary cutter which make use of 45 mm blades. (3) Multi-Purpose- You can use it with any DIY projects of yours. Basic use is for cutting fabric and paper but it can also be use with form, cardboard, etc. (4) Pack of 10- If you have cutter we are providing spare blades to make use of that cutter.