Backed by 2 full sheets of fiberglass to withstand extreme use, Dewalt Type 1 metal cutting high speed wheels feature a high grain concentration for aggressive cutting and smooth-running wheels. A soft formulation delivers fast cuts. Designed for a variety of metal-cutting applications. Softer Formulation For Faster Cutting2 full sheets of fiberglass for durability and safety.Proprietary material mix ensures durable long life wheels