I currently own 4 balls ones a Utra Zone, the others are No Mercy Beat'n, Black Ice and Elite Eclipse.  i use my elite eclipse for heavy medium oil, and its 400 grit sanded but lately it has been skidding allot and coming in late than it use to. I have tried hot water bathing it to get the oil out, heck i even resanded it a few times when it got shiny again but on the lanes i play on. They are oily and its kinda a mix of the cheetah and shark. i don't throw allot of revs so i cant just fix it i need my ball to hook the way i just throw it. Any one have some suggestions on what i should do to my eclipse or should i use another ball i have on my rack for heavy and medium oil.