That is what was used at the amateur jai alai in Milford. They told us it was a ball they used in japan's pro league. We use to use them when we played in South Norwalk. The guys I played with actual would keep the balls warm in hot water (Ball would slow down when cold - Winter). That was the best outdoor court I ever saw or played on. Does anyone remember that court in South Norwalk? One player ended up having a heart attack on the court so the company put up a fense so no one could play there anymore (insurance).