Made of high quality silicon carbide grit, Dura-Green Stones are exceptional for fast contouring and finishing of porcelain, composites, compomers, gold, silver and amalgam. These concentric, fast-cutting stones come in HP and CA shank size. A selected number of shapes are available in FG shank. All are packed one dozen per box, with the most popular HP shapes available in economical half-gross packages. NEW! Dura-Green Stones Fine (yellow marked) provide a smooth surface while grinding, contouring, and finishing porcelains, composites, compomers, gold, silver, and amalgams. When contouring with abrasives iusing large grit size particles, some cracks may remain. Dura-Green Stones Fine eliminates this risk. Excellent for adding surface characteristics and adjusting details, Dura-Green Stones Fine saves time and allow for an efficient polished surface.