BOSU on Twitter: "The #BOSU Ballast® Ball comes in 2 different sizes. - The 65 cm #BallastBall is specifically designed for Club or Gym use by multiple people in clas-type settings -
BOSU® Ballast® Ball
Ballast® Ball - 45 cm – Fitbod Store
Plaza Indonesia
BOSU Ballast Ball Inflation with New Plug - YouTube