The Dunlop Pro Racketball Ball - 3 Ball Box is a perfect choice for both intermediate and advanced players. These black, double-dotted balls provide great durability and consistency. They are engineered using the N-1SR3 construction technology - a feature of Dunlop's world no. 1 squash ball. The N-1SR3 technology incorporates an elastic hydrocarbon polymer with 12 compounds that creates an exceptional material which ensures supreme playability.