The OptimumFlip coverstock is Brunswick's newest development based off our performance enhancing additive chemistry research. OptimumFlip coverstock provides the sharpest breakpoint shape than any Brunswick ball to date. The sharp breakpoint shape is increased by added traction on the backend. The new OptimumFlip coverstock incorporates a new base reactive along with our additive technology to create exceptional traction in oil for the Brunswick product line. The new Nexus Rotor core integrates a center stabilizing capsule and two vertical flip claws. The center stabilizing capsule revs quickly to control the midlane. As the axis migrates and the core lays down, the vertical flip claws take over maintaining the rev rate for a strong continuation through the backend and powerful drive through the pins. With its Rough Buff finish, the Nexus™ Evolution X produces a high hook potential with a strong flip on the backend. The Nexus™ Evolution X skids through the front, saves axis rotation in the midlane and grabs the backend for unbelievable flip on medium to heavy oil lane conditions. The Nexus™ Evolution X 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 RGdifferential that is close enough to the 14 to 16 pound shape so the same drilling instructions can be used.