The Ringsport adjustable Boxing Ball on Stand is a Free Standing Speed Ball that is a great addition to any boxing or home gym for beginners to advanced boxers and Fitness EnthusiastsImprove your hand/eye co-ordination with the Adjustable Boxing Ball on Stand as well as aerobic fitness and endurance.Features:Ideal for those wanting the benefits of regular speed ball workouts without having to mount a large stationary platform in their homeThe speed ball features a durable PVC covered speed bag that mimics the movement of an actual opponent. The ball is filled with foam with a 20cm diameterThe speed ball is adjustable from 125 - 150 cm to suit a wide range of user heightsA flexible chrome plated coil spring provides tough and durable workoutsThe sturdy base is made of commercial grade PVC and should be filled with water or sand before use to provide stability for the hardest punchesProtective foam collar under the bag helps prevent injury