Hello, Let me start out by saying I have been using Hammer equipment, but I decided to buy a Formula last week. It is 15.4 long 1 inch pin, 2 3/4 top. I bought one and drilled it up myself. I had a suggestion to drill it up 4x4, so I did. Let me tell you this ball is awsome. I first used it in my scratch league thursday night. Shot has had some heavier oil outside. I played outside and the ball came back with great power. Shot 732 with it. Tried it friday night and the shot is a christmas tree pattern. shot 236,236,300. Then I took it to a tournament on Sat. Shot was very dry outside and medium inside. I could swing this ball very well and it would come back with energy and still smash the pocket. This has got to be one of the best balls in my opinion on the market for the money. If anyone is thinking of buying this ball do not hesitate. Great all around ball for me..