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TheraBand Exercise Ball, Stability Ball with 55 cm Diameter for Athletes 5'1" to 5'6" Tall, Standard Fitness Ball for Posture, Balance, Yoga, Pilates, Core, & Rehab, Red : Amazon.ca: Sports & Outdoors
Physiotherapy Room Elite Series 55cm Exercise Ball | Physio Store
Stability Ball™ with pump - 55 cm (Black) for Pilates | Merrithew®