Is it safe to play the bumper balls? Bumper ball is a safe and protective ball with adjustable shoulder straps and handles inside. It covers the player's upper body and head. You can flip, bounce, crash into each other with no damage to the ball or injury to the player. Specifications: Size: 1.2m/4FT Diameter Supports Weight: 100 to 200 lbs Suitable: Adults & Material: PVC Thickness: 0.5mm Color: Blue Usage: Leisure centres, Parks Package Contents: Bubble ball Tips: 1. Make sure your head is well inside the bubble ball and don't lift the bubble ball too high. 2. Limit the running distance and speed. 3. Use the sides of the bubble ball to knock down with other players, not the top.