Brunswick Mastermind Scholar Bowling Ball (15lbs) Honor Roll A Plus Pearl coverstock offers the most aggressive pearl coverstock to date for a Brunswick ball. This aggressive pearl coverstock produces easy length through the heads with supreme traction on the backend to achieve ultimate flip. The Mastermind Ultra Low RG core features a single density squared-off elliptical inner core. The core is dynamically designed to extend the rotational energy, boosting angular velocity to transfer energy to the pins for increased pin action and higher scores. The new Mastermind Scholar with its Royal Shine finish, provides maximum length through heads, mid lane traction with an aggressive move on the backend on medium to oily lane conditions. The Mastermind Scholar can be drilled using the standard drilling techniques developed for asymmetric core bowling balls. At Brunswick, the unique core shape of each individual ball is used for weights from 14 to 16 pounds. This approach to lightweight ball engineering provides bowlers with consistent ball reaction characteristics across this weight range. At 12 and 13 pounds, Brunswick uses a generic core shape with a RG-differential that is close enough to the 14 to 16 pound shape so the same drilling instructions can be used. Core Type: Mastermind Ultra Low RG Coverstock: Honor Roll A Plus Pearl Reactive Color: 3 Color, Blue, Silver, and Gold Pearl Finishing Steps: 500 Siaair Micro Pad, Royal Compound, Royal Shine RG Max: 2.540 RG Min: 2.488 RG Differential: 0.052