Air cushions create an instability that is challenging and fun, testing balance and co-ordination skills. Less air increases the difficulty as the cushion becomes soft and unstable. More air makes the disc easier as it becomes more stable. The discs can be turned upside down and used as a cushion. Colourful inflatable discs that offer a wide variety of balance activities. Size 32cm diameter. Sold per pack of 6 - one of each colour - red, yellow, blue, green, purple and orange.