i must agree with the majority of other users. the uranium has the most back end of anything that i have ever thrown..mine is drilled label lev just like on the sheet with no balance hole.ball is very clean down the lane.i am amazed as to how far it goes down b4 it makes its move,then when it moves its amazing.actually, i am sort of struggling with it a bit as i have yet to get used to the amount of backend.i ahve left lots of 9 pins,more than i ever have with a new ball.first night out, ,left 4 in one game.the ball seems to create almost to big an angle as it seems to be slicing in more behind the head pin than flush in the pocket.i am sure that after some adjusting , this will be my number one ball. my stats are as follows: right handed approx 19.5 mph with a above ave rev rate( i guess you would call that a tweener). the other lane one balls i currently own are the BCB,CB,SD,EP,PC,XXXL.thanx for reading this prob overwinded post.