I've seen a bowler for the past 4 weeks throw one in a 4 game scratch league. I Believe its a 3 1/2 x 3 1/2 stack with no extra hole. This ball is AWESOME. The bowler has 10 degrees of tilt and about 20 degrees rotation with medium speed. This ball NEVER overreacts. I can't wait to get my hands on one. The pins stay low, it rolls out with power, never goes DOA, I can't see a bad part in this ball. FYI, we are bowling on 3 yr old brunswick synthetics, we don't have an over abuncdance of oil in the fronts, but we do have electric backends on the fresh as you could imagine. Yet the ball doesn't over react back there. I am THOUROUGHLY impressed. The last time I liked a ball SO much was last year when I got my first detour and shot 831 with it. GET THIS BALL!!!!
- Ricky