Olfa 28mm Rotary Blade Replacement Pack ~ 2 Count; 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). 2 blades per pack. Good For: general quilting, sewing and craft projects. Can be used in industrial applications. Smaller size makes it ideal for curves and cutting out patterns.