The Olfa Rotary Blade is designed for maximum durability and long-lasting projects. The blade is made of tungsten tool steel and can cut up to eight layers of fabric. This blade is very sharp right out of the package and stays that way for a long time thanks to its high-quality construction. The included blade also comes in a convenient plastic container that can be used as a safe disposal case. This blade cuts fabrics such as paper, vinyl, tarp, fleece, felt, and more. The blade fits any Olfa 60mm rotary cutter.