45cm/55cm/65cm/75cm Thickened Yoga Ball with Foot Pump for Stability Z9U5 | eBay
Physiotherapy Room Elite Series 55cm Exercise Ball | Physio Store
Exercise Ball -Professional Grade Exercise Equipment Anti Burst Tested with Hand Pump- Supports 2200lbs- Includes Workout Guide Access- 55cm/65cm/75cm/85cm Balance Balls (Dark Grey, 85 cm) : Amazon.ca: Sports & Outdoors
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TRX STABILITY BALL
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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
Element Fitness Commercial 65cm Stability Ball – The Treadmill Factory