DescriptionCommodity Quality Certification : ceThis product may be intended for use by a health care professional use only.The seller may ask you to evidence you are a qualified health care professional entitled to buy and use such products in your country.DescriptionGreat for grinding copper, aluminum and other metal materialsConducting smooth precise high-quality processingSafe, reliable and easy to useDiameter:2.35mmGreen stone(contour ceramic):made of silicone carbide, medium grit,excellent for contouring and shaping porcelain and metals.Pink stone (for metal,alloy):made of aluminum oxide, medium grit,for all types of metals,non-contamination of precious and semi-precious alloys.White stone (for metal,alloy,composite):made of pure aluminum oxide, fine grit, for smooth grinding and polishing of filling materials and composites.Packing:10pcs