The New AMF Pure with the F90 cover stock is designed for large amounts of oil. I drilled my Pure with a 4 X 4 X 2 layout and found that I had the greatest success on the longer sport patterns especially the 52' pattern, the ball really performed great. I then used the Pure on the 39' house pattern and found that I had to apply a little polish to get the ball to clear the front of the lane and retain enough energy to get the corners out, overall the Pure has very smooth and continuous motion on the backend no matter what pattern you are playing on. The Pure will fit anybody's style from the high rev to the low rev with a little surface adjustment. The Pure is a must add to the bag for the USBC Open Championships in El Paso. Mike811