Dura-White Stones have a micro aluminium oxide grit and are unsurpassed for finishing enamel, preparing tooth cores, glass ionomer cements, composites and porcelain. | Perfectly balanced to provide vibration-free performance. | Speed Range: 5,000 - 20,000 min-1. | Precision running. Vibration-free finishing. | Consistent finishing performance. | Good operating life. - Pack of 12