55-75cm Color Coded Fitness Balls -- Aeromat (381)
Stability Ball 55 cm - 55 cm | Club Piscine Super Fitness
TheraBand Exercise Ball, Professional Series Stability Ball with 55 cm Diameter for Athletes 5'1" to 5'6" Tall, Slow Deflate Fitness Ball for Improved Posture, Balance, Yoga, Pilates, Core, Red : Amazon.ca: Sports