Pure Surface 4 pack set. Includes grit types: 500 (White), 800 (Blue), 1k (Purple), and 2k (Orange) The ultimate in ball surface adjustment technology, Pure Surface pads feature a revolutionary patented cloth backing laminated to flexible foam. This allows for superior transpiration of the material, which helps extend the life span of the pad and achieves an even finish quality that is beyond compare. It also improves the anti-clogging properties, helps keep the working temperature down and allows for increased dust suction for a cleaner working environment.