Can you imagine 6 simultaneous softball games being played at the same time and on the same court? All this is going on safely by being color controlled. To differentiate teams and avoid confusion, every set is shipped with 6 color-matched pairs of bats and balls. Bats are made of safe dense foam rubber with reinforcing plastic inner tube. Junior bat: length 69cm, weight 325g. Senior bat: length 74cm, weight 390g. Ball: diameter 9cm, weight 40g.