Product Description The ALL NEW S84 Beta Hybrid Cover was designed to complementthe S84 Response Cover. This revolutionary material reduces themicroscopic pore sizes while maintaining the teeth that itspredecessor became famous for. S84 Beta offers a similar overallhook potential versus S84 Response, but a vastly different backendshape. Paired with the Disturbance Asymmetric Core, the 900 Global Reality Check bowling ball will offer the most angular reaction ever for the 900 Series!!The Disturbance Asymmetric core is back and creates asymmetry by having differing shapes on the bottom and top of the weight block. This core was designed with a focus on a shape that will fill a space with the least amount of material, yet still yield the RG/Diff values that all bowlers demand.