This is a rare overseas Storm bowling ball that is USBC approved for league play. 

Cover: Nex+ Pearl Reactive
Core: RAD-A core
RG: 2.51 (15lbs)
Diff: .053 (15lbs)
Mass bias: .015 (15lbs)
Color: Deep Purple/Black
Surface: 1500 Grit Polish
Fragrance: Kiwi Cantaloupe