The SD73 features a coverstock that is so agressive it is not allowed on the PBA Tour. The future of the game is Proactive Maintain traction in the oil, and wont overreact without it. Brunswick - Zone Pro Violet Rev it up and watch it shine Designed to provide extra bite through the heavy oil of today's lane conditions. Increased friction in the oil results in a strong arcing reaction with continued hook on the backend. The Rg remains low for strong revving action in the midlanes.
Special additives allow it to hook on even the heaviest oil pattern.