Bosu Ballast Ball - the new school of stability ball training with all the features of the traditional! Product Features: filled with 2.5kg of beads to keep the ball in place and and stop it from wandering, allowing a safer and more effective workout the beads provide an audible sound when the Bosu Ballast Ball is moved, allowing the user to move more efficiently. The weight added to the ballast creates its own dynamic resistance during movements and helps train stabilisation and co-ordination. Supplied with foot pump and workout DVD 65cm diameter, the ball provides an audible and visible stimulus when it is moved, allowing the user to move more efficiently. Warranty 6 months Bosu Ballast Ball - the new school of stability ball training with all the features of the traditional! Product Features: filled with 2.5kg of beads to keep the ball in place and and stop it from wandering, allowing a safer and more effective workout the beads provide an audible sound when the Bosu Ballast Ball is