The basics A rolling razor blade that's perfect for all of your sewing and quilting needs. The benefits Comfortable ergonomic handle reduces hand and wrist fatigue, and dual-action safety lock allows the blade to lock open for comfort and closed for safety. The uses Sharp enough to cut through more than 6 layers of fabric, making quick work of your strip, block, and pattern cutting. The bottom line Blade is made of high quality tungsten carbide tool steel for unparalleled sharpness and superior edge retention. For right and left-handed use.