A36F - Aluminum oxide grain. Open pattern on wheel allows for cool blending and finishing without loading. A medium grit for finishes equal to an 80 grit coated disc. Flexible for smooth blending and finishing. Stainless steel, Aluminum and non-ferrous materials. SAITBLENDdiscs combine the long life and durability of a bonded Type 27 wheel with the flexibility and finishing capabilities of a coated disc. There is no need to change discs to go from blending to final finishing. A single disc will quickly blend your weld and finish equivalent to an 80 grit resin fiber disc, and the SAITBLEND disc will outlast the fiber disc 20:1.