Brunswick Rhino Bowling BallColor: Red/Black/Gold PearlCoverstock: R-16 ReactiveWeight Block: Light BulbFactory Finish: 500 Siaair/Crown Factory Compound/Crown Factory ShineFlare Potential:MediumRadius of Gyration (RG):16lbs – 2.511; 15lbs – 2.524; 14lbs – 2.540Differential (Diff):16lbs – 0.030; 15lbs – 0.030; 14lbs – 0.030Intermediate Differential (Diff):N/AFragrance:N/AAdditional product information: The R-16 reactive coverstock describes our formulation that provides a perfect balance between power and control. The R-16 formula produces easy length and backend hook motion without extreme sensitivity to the dry and oily parts of the lane. Combined with the traditional light bulb core shape, the Rhino delivers outstanding ball motion and impressive pin action for more strikes and higher scores.