These blades are made out of high carbon steel, and are designed with a universal opening and will fit on other 45 mm rotary cutters with the same design, such as Olfa and Fiskar.
They are constructed from high carbon steel, which are the same materials we make our Midnight Edition Shears from.
This can vary person to person, depending on how they use their cutter and the type of cutting mat they have. We tested our rotary blades at different fabric shops in Toronto, who are cutting up to 8 hours a day, five to seven days a week. The results show that our rotary blades that lasted between 3 - 4 months.