These 45mm Rotary Blades from LDH 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're constructed from high carbon steel, which are the same materials made from LDH's Midnight Edition Shears.
This can vary person to person, depending on how they use their cutter and the type of cutting mat they have. LDH have tested their rotary blades at different busy fabric shops in Toronto, and the results show that their rotary blades last between 3 - 4 months.
Pack of 5.