Improve your speed, agility, attacking and defensive techniques with the King Cobra™ FREE STANDING BALL. Its heavy-duty commercial spring provides lightning-fast rebound and movement in all directions. Perfect for beginners and experts alike, you can adjust the height from 153cm to 183cm, making it usable for any size. All you need is a two by two meter space and you're ready to go - the box comes with tools and instructions for quickly filling the water or sand-filled base. Worry-free as it's been tested and approved for weather and UV rays.