The 4" diamond polishing pads for engineered stones are specially made for engineered stones such as silestone, hahnstone, technostone, cambria and zodiac. They are designed and tested to work more aggressive and long lasting on engineered stones. A set includes 8 pcs include 50 grit, 100 grit, 200, 400, 800, 1500, 3000 grit and a black or white buff pad. Features include: