Information on Ball Hardness Check

USBC Urethane Bowling Ball
Hardness Check at U.S. Open

USBC will conduct a bowling ball hardness check at the 2020 U.S. Open for all drilled balls with urethane or blended urethane shells.

The following links have additional information for competitors:

• Key points concerning USBC ball hardness check at 2020 U.S. Open
    
• Overview, schedule for testing
    
• U.S. Open Urethane Bowling Ball Inspection Form
  
  
• PBA message
  
  
• 2020 U.S. Open Ball Hardness Testing - Preliminary Report