I drilled my Hot Cell up 50x4x35. I wanted to get the large amount of flare to help me get this thing rolling. I left it box surface which is 1000 grit. This ball is a pretty neat toy for me to use. The Hot Cell had a large amount of flare compared to the Pitch Black. I had trouble with the Pitch Black getting into enough of a roll for my lower rev style to take advantage of. The Hot Cell picked up strong and got thru the pins very hard. Put this one if your bag if your not heavy handed enough to throw a Pitch series ball but want to see what the new urethane revolution is all about.