Penn Tennis Balls, Extra Duty Felt, Championship TENNNIS BALLS 1 DZ Penn Championship is America’s #1 Selling Tennis Ball and represents the standard by which all other tennis balls are measured. It features a controlled fiber release for consistent nap, natural rubber for consistent feel and reduced shock, and interlocked wool fiber for longer wear. Penn Championship is the Official Ball of USTA Leagues. It is USTA and ITF approved. The Championship Line provides quality play every time you hit the court. Safer Choice: No | MPI Item: No | Package Quantity: 1 | OMRI Item: No | Minimum Quantity: 1 | Green Seal Certified: No | Quotable Product: No | FSC Item: No | Watersense Item: No | Green Product: No | SCS Item: No | DLC Item: No | Hazmat: No | DFE Item: No | Berry Amendment Item: No | NEMA: No | AbilityOne Item: No | CPG Item: No | Watts: No | EnergyStar Item: No | Country of Origin: Ch | UOM: Each | EcoLogo: No | GSA Approved: Yes | Biopreferred Item: No | Proposition 65 Warning: No