OLFA 28mm Replacement Rotary Blades. Circular rotary replacement blade for our 28mm rotary cutters used for quilting, sewing, and general crafts. Ideal for small-scale projects and tight corners. This blade is made of high quality tungsten tool steel for unparalleled sharpness and superior edge retention. For Original 28mm Rotary Cutter (RTY1) and Deluxe 28mm Rotary Cutter (RTY-1/DX). 5 blades per pack. Perfect for cutting cloth, leather, paper, vinyl, wallpaper and more. CHK-RB28-5