The Zorb balls are for all ages! The rental includes 1 pair of zorb balls. An area of 20′x20′ or larger is suggested for rolling around safely. Once you get inside, you’ll understand the term ‘human hamster ball’. An attendant is important to ensure the safety of those in the Zorb Balls. This could be a volunteer of your own or someone from our company. An attendant from our company is $30 per hour. While the Zorb Balls do not need continuous power, they will need electricity throughout the event for re inflation and will need an electrical source at set up to inflate the hamster balls.