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Hammer created the Raw series of bowling balls to enhance an experienced bowler's arsenal and to offer beginners a performance option for their first bowling ball. The Hammer Raw Pearl Blue/Silver/White features the Raw Hammer core which is covered with the Juiced Pearl coverstock then finished with a 500 then 1000 then 2000 grit Siaair sanding pad and finally polished with Crown Factory Polish. This combination of core, cover and finish gives this ball a skid/flip reaction and is ideal for light to medium oil.