Dura-Green Stones are excellent for fast contouring and finishing. These silicon-carbide stones are ideal for surface characterization and adjusting details, and are long-lasting, fast-cutting, and always concentric in motion. Use Dura-Green Stones for: composites, amalgams, precious alloys, non-precious alloys, and porcelains. Use Dura-Green Fine Stones for: composites and porcelains. Dura-Green is available in 44 different shapes, and as HP, HP Fine, CA, and FG.