Here is a statement from the Professional Bowlers Association regarding the ban of 6 balls at USBC national tournaments:
With regards to the USBC decision to ban select bowling balls from different levels of its certified competition, there may be some confusion over what equipment is allowed in the PBA. The following is intended to clarify the situation relative to the PBA.
To review Tuesday’s United States Bowling Congress announcement, the USBC prohibited the following six previously-certified bowling balls from use in USBC national events (including this week’s USBC Masters), but they remain allowed in other USBC competitions (including league play): Storm Phaze 4, Storm Electrify Solid, Storm Trend 2, 900 Global Altered Reality, 900 Global Wolverine and Roto Grip UFO Alert.
All six of those bowling balls remain allowed in all PBA competitions. The PBA has no data or indication that those USBC-certified bowling balls would fail field tests. Again, the six aforementioned bowling balls are allowed in all PBA-conducted competitions, including the upcoming PBA Playoffs, PBA Tour Finals, PBA50 National Tour, and PBA Regional Tour events.
The timing of Tuesday’s USBC ruling, during the USBC Masters, prompted the PBA to grant its members complimentary drillings on the player services trailer for bowling balls replacing the newly prohibited equipment. While the USBC Masters is a PBA Tour major championship, the event is conducted by the USBC under USBC rules.