Pail Sets from MansionAthletics. Includes 48 MansionAthletics pressureless tennis balls. When space is at a premium, KEEPERS! are just what you're looking for. We've taken our sturdy 5-gallon pail with its unique seat lid and filled it to the brim with a quantity of our most exciting items! And with each set you purchase, you receive the pail free! Why not start stocking up on these sets today--they're all KEEPERS! Tennis Ball Set.