The Roto Grip Idol Pearl uses the Ikon core that changed the perception of the HP3 line for Roto Grip. This core has a low RG symmetrical shape with high differential that generates flare as well as awesome motion down the lane and on through the pin deck. The Idol Pearl introduces the xTrax-P18 Pearl Reactive coverstock which was designed to compliment the original Idol bowling ball. This cover is finished with a 1500 grit pad and then polished. This ball can handle most any lane condition but is best used on medium to medium/heavy oil. *There will be some variance in color due to the Nano material. This is due to "phasing". Some of the balls with phasing have a white color in them and some may appear to have water spots.