The Addaptive ƒ (PF) Hybrid coverstock is Brunswick's newest advancement in performance enhancing additive chemistry. ƒ (PF) Hybrid describes our latest ƒormula which we combine our proven ƒ (PF) solid with a pearl creating a highly versatile coverstock. This new formulation produces easy length through the heads and midlane, while maintaining traction on the backend for a strong continuous arc. The new Meanstreak™ Medium RG symmetrical core features a long and lean design to provide maximum energy retention. By increasing the mass around the equator compared to the original Meanstreak™ High RG core, the maximum RG is lowered further stabilizing the dynamics to increase the midlane traction of the core. With its Rough Buff finish, the Meanstreak™ Brawler skids easily through the front part of the lane, revving strong in the midlane for a strong continuous breakpoint. This combination of coverstock and core creates an extremely versatile motion on medium dry to medium oily lane conditions. The Meanstreak™ Brawler can be drilled using the standard drilling techniques developed for symmetric 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 RGdifferential that is close enough to the 14 to 16 pound shape so the same drilling instructions can be used.