Alumina sand, hard cloth material, dark brown sand particle size between 24 # -1000 #, can the oil mill or mill, or shaped abrasive belt can be made as one hundred thousand impeller blades use, good polishing effect, stable quality, commonly used in stainless steel heat sink / alloy products / steel and other metal surfaces such as brushed sanding. Surface finish, no grit sand more evenly than other brands, synchronous consumption is also very good.