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Ideal for improving balance, coordination, flexibility and muscle strength Perfect sitting opportunity for strengthening the back muscles Thanks to the anti-burst system, the air escapes slowly instead of all at once if it gets damaged The anti-slip, ribbed surface provides extra adhesion Comes in 5 different sizes / colours: 45 cm / yellow, 55 cm / orange, 65 cm / green, 75 cm / red and 85 cm / blue; can take up to 272 kg in weight. Colour pattern: varied