Ceramic Grain Sanding Discs are resin bonded and closed coated. These discs will outlast both aluminum oxide and zirconia discs while cutting faster and cooler. Ceramic grain is best suited for grinding and sanding stainless and other tough metals. The grains on these sanding discs micro-fracture to enable a continuous supply of the sharpest edges, and they are more resistant to heat. When considering a ceramic disc, the operator must decide whether the increased longevity is worth the extra money, factoring in details such as the reduction in downtime for changeover and the reduction in inventory for extra products. Many times, the more expensive ceramic flap disc provides the lowest overall cost of use when these factors are considered.