This piece is the WOW piece to end all WOW pieces! It is 30 feet by 30 feet round and is also about 20 feet tall. It has a big inflatable ball which acts as a wrecking ball to knock the players off their inflatable stands. This is a great piece and a must for any large event. This piece uses a one and a half horse power blower which blows it up nice and firm and also has a five foot safety wall that goes all the way around the unit. This is a very popular unit and fun for all ages.