The HURRICANE ES WHITE 7 STEP POLISHING SYSTEM by Diamax is designed for engineered stone and granite. WET only. Use with an angle grinder or air polisher. 4", white resin, velcro back. MAX RPM: 4,000. Provides all the great features of the Cyclone version at an economical price level. Outperforms other industry brands at the same price point level. More forgiving when polishing engineered stone with minimal water.