SUNBURST® Knife Edge Radial Discs are shaped to access hard-to-reach areas without removing detail or causing flat spots. The sharp, clean, specially treated ceramic abrasive grain embedded throughout their thin flexible bristles enables them to work faster and last longer than rubber wheels, brushes, buffs and conventional sanders. SUNBURST® Radial Discs generate minimal dust and heat and eliminate the need for polishing compound. Ideal for finishing, smoothing and high-luster polishing of all precious, semi-precious and non-precious metals, acrylics and ceramics. Available in 80, 120, 220, 400, 600 (pumice), 6 micron and 1 micron grits. Pumice discs will not scratch stones.