DURABLE: The Babolat Gold High Altitude Tennis Ball is a high-performance low-pressurized ball that combines durability with great playability in high altitudes. HIGH ALTITUDE: Designed to be played on courts located in higher elevations (3,500+ feet above sea level). USTA & ITF APPROVED: The tennis ball must lie within the specifications laid down in the Rules of Tennis while providing consistent playing properties and being sufficiently durable to withstand repeated high-speed impacts with the racket and surface. SPECIFICATIONS: Composition: Felt + Rubber; Surface: All Court; Color: Yellow. MULTIPACK CONVENIENCE: Are you looking for more than one can, but don't want to buy a whole case? We've got you covered - Choose anywhere from 2 to 24 cans to help reduce packaging waste and trucks on the road. Who cares about the planet? We Do!!! The Babolat Gold High Altitude Tennis Ball is a high-performance low-pressurized ball that combines durability with great playability in high altitudes. Available in packs from 2 cans to 24 cans