I have an UI with a fairly dull surface probably around 500 grit or so. The proshop dude was using a burgandy SB not new so it's probably a little higher than 500 grit. Anyway, mine is drilled for length and backend and it works well on mediums on up. Just used it today in league and it got down the lane surprisingly easy and revved up hard in the midlane and had a strong arcing backend. I loved it. As long as your bowling on medium and up, with a length drilling, this ball offers great hit, carry, and control.
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