Great for group activities and projects, the Gymnic Megaball can be used as a spring mattress if not fully inflated. Often found on playgrounds, for all kind of games, these giant play balls can now be seen in gymnastics and sports, at schools and in offices. Inflate with compressor or hand pump, this ball is available in 60" or 72" diameters.

A great resource for these balls is also the Great Games for Big Activitity Balls book.