New More Durable Formula! Designated for Summer / Warm Weather Use. Contains 1 sleeve with 3 PT Pro Ultra Dura Summer Platform Tennis Balls. New more durable flocking for 2020! The PT Pro Warm Weather APTA approved platform tennis balls are designed to be the most durable platform tennis ball on the market. With years of development you can expect to receive performance, consistency, looks, durability and control. PT Pro summer balls are specifically engineered to give the proper amount of bounce when playing in warmer conditions. Buying direct from PT Pro allows us to offer you unprecedented savings on your platform tennis ball needs. PT Pro provides premium quality APTA approved platform tennis balls at a low cost to promote the sport for the players