More than 90 percent of Japanese children play with a high performance ball constructed with a durable rubber cover and an air cushioned center. Nagase Kensko Corporation (NKC) is far and away the industry leader, holding a market share of more than 60 %. In the seventy years it has been manufacturing this product - over six billion balls have been sold - without a single serious injury. The Kenko ball compresses upon impact to absorb shocks and reduce injury. The surface features an aerodynamically-designed surface and a raised seam to stimulate the characteristics, flight and bounce of regulation baseball. Available in three sizes and weights to meet the needs of younger children and to facilitate their use in pitching machines, the Kenko baseball is the official licensed baseball of Major League Baseball International's Pitch, Hit and Run Program and many other youth programs around the world.