Material: proprietary aluminum oxide grain for long life and fast cutting.double fiberglass mesh reinforced for further safety and durability Excellent Heat Dissipation - From the perspective of professionalism, PEGATEC metal cutting discs is a professional grinding wheel that can act on aluminum. wheels have nearly perfect heat dissipation, reduce thermal burns, and can act on metal materials with a relatively low melting point. Excellent Moisture Resistance - Because the adhesive is afraid of moisture, the service life of many grinding wheels is very limited, and the sharpness of the cutting discs after being damp will be greatly reduced. PEGATEC metal cutting has a three-layer moisture-proof net, which maximizes the service life of the grinding wheel on the basis of ensuring performance.