Olfa RB45 blade is made of special high quality tool steel, it retains a maximum sharp edge
Fits any OLFA 45mm rotary cutters, models RB45, RB45H-1, RTY-2/G, RTY-2/DX, RTY-2/NS
Excellent For:
Cutting multiple layers of fabric at once saving you precious time. 
Cutting strips and multiple layers of Textiles, Paper, cardboard, fabric, Canvas, vinyl, Leatherette, upholstery and more.