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Sunny Health & Fitness Anti-Burst Gym Ball, 55 CM : Amazon.sg: Sporting Goods
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Amazon.com: Reebok Gymball - 55cm Exercise Ball with Dual Textured Non-Slip Surface for Maximum Grip - for Core Workout, Improving Stability, and Posture at Home or The Gym - Pump Included -
Amazon.com: Yoga Ball/Explosion-Proof Fitness Ball/Training Ball/Slimming Fitness Ball/Yoga Ball Anti-Burst Fitness Ball 55/65/75/85/95 cm (Color : A, Size : 55CM) : Sports & Outdoors
