The official Wimbledon 2015 Tennis Balls from Slazenger. A 3 ball pack engineered for optimal performance when you next step onto the court. Made with a premium woven cloth that uses the finest wool to achieve a tighter weave for increased durability and responsiveness. With an Ultra Vis dye for enhances visibility for players and spectators, their Hydroguard Technology repels up to 70% more water than a standard ball, minimising distractions during rainy games.. Material: 100% Rubber