I drilled the SMTM 50x4x30. I must say upfront that I was completely wrong about this ball when I first got it. Okay, if you are looking for the ball after urethane will not hook, this is your ball of choice... The SMTM reads super early and still retains energy to make awesome motions when it sees the friction. It's strong , smooth and continuous... When your BIG BRO burn-up burns out (LOL), then you go to this awesome piece. This is great for house and short to medium sport patterns when you need to keep the ball motion in front of you... Great strong ball that reads from front to back of the lane. Get you one, you won't regret it...period!!!