Comments about Roto Grip Grenade:

Grenade – (with the pin up between fingers) Specs 5x4 3" buffer 60x5x40 (dual angle)
This ball is very weak and has a really good mid lane read. It does not overreact on wet/dry conditions but it is oil sensitive. This ball works best on dryer lanes and is very smooth and predictable when lanes are broken down and all your other bowling balls are hooking way too much. This ball works well on wood or synthetic lanes and sport patterns. It will allow you to work closer to the pocket without over hooking it to the head pin.
Grenade – (with the pin on the axis) Specs 3x5 2" buffer 110x3x40 (dual angle)
With these specs the ball has a little more mid lane roll and a little less back end. It works even better on dryer lanes and has more of an arc shape reaction. I used this layout at the USBC Nationals in Reno and it kept me out of trouble on tougher lane conditions. I would recommend this ball for all high rev. players looking for something that is straighter and smoother than anything they have ever thrown.