See how to change the blade on your Omnigrid® rotary cutter. Using a sharp rotary blade makes cutting easier. Keep a spare one handy in case you need to change it before or during a quilting, sewing, DIY home decorating and crafting project. Made of the finest quality tungsten-carbon steel, use an Omnigrid® rotary blade (with an Omnigrid® Rotary Cutter) to cut materials such as fabric, paper, leather, vinyl, mat board and foam core.