Wacces Yoga Ball with Hand Pump EXCELLENT COMPANION: Wacces Yoga Balls promotes your overall strength, agility and balance at home, gym or in your office. ONE-FOR-ALL: Can be used as a Yoga, Pilates, fitness, workout, training or gym ball or pregnancy gymnastics equipment. OFFICE BALL CHAIR: It can be used as an office ball chair to improve your posture and relieve back pain. ANTI-BURST & DURABLE: Designed with anti-burst technology and durable enough up to 2000 lbs. Made of hypo-allergenic rubber. MULTIPLE SIZE: Comes with a pump and have three size options: 55 cm (22 inches), 65 cm (26 inches), 75 cm (30 inches). 55cm ball for users 5 ft. 5 in. and under 65cm ball for users 5 ft. 4 in.- 5 ft 11 in 75cm ball for users 5 ft 11 in and higher