Double Yellow Dot Competition Ball; The Official Ball of the WSF, PSA and WSA;;The Only Ball Used in Professional International Competition;;The Ultimate Performance Squash Ball for Professional, Tournament and Club Players;;N-1SR Molecular Technology; Ball Size: Standard 40mm; Player Type: Advanced;;Ball Bounce: Standard (The Lowest Bounce of all 4 Balls in the Range); Quantity: 1 Dozen (12 Balls);