The Vollint Premier are premium pressurized tennis balls delivering optimum playability and increased durability on all court surfaces. They are ideal for competition-level play, match use and coaching and have a quality UK woven wool cloth for a blend of performance and consistency. The balls utilise internal air pressure to reduce the weight and provide greater speed, spin, and bounce. With a thick, bright yellow extra-duty felt, the balls guarantee a longer lifespan, better resilience, and improved visibility on the court. Plus, they feature a durable rubber core and come in a 6-dozen pack (72 balls).