Quick Start 78 Balls are the final transition balls for use on full 78-foot long courts. They are proven to help players of all ages slow down full-court play for maximum improvement. The ITF uses them in Europe with great success. Just think of them as transition balls to allow longer rallies on full-length courts since the balls travel at about 75% the speed of regular balls. Case of 24 cans of 3 balls each.