Wacces Professional Exercise, Stability and Yoga Ball for Fitness, Balance & Gym Workouts- Anti Burst - Quick Pump Included SUPERIOR QUALITY: Grade-A quality eco-friendly rubber material, designed with anti-burst technology and durable enough up to 2000 lbs. MULTIPLE USAGE: Perfect companion during your workouts, moreover you can use it during your yoga, pilates, pregnancy gymnastics exercises. CORE STRENGTH: Wacces professional yoga balls promotes your overall strength, agility and balance at home, gym or in your office. OFFICE CHAIR: Have back pain? Use our yoga balls as an office ball chair to improve your posture and relieve back pain. 3 SIZE WITH QUICK PUMP: Our balls come with a free quick pump and have three size options: 55 cm (22 inches), 65 cm (26 inches), 75 cm (30 inches).