Prosource Fit Stability Exercise Ball with Foot Pump, Black 55, 65 cm or 75 cm, Anti-Burst up to 2,000 lb. for Fitness, Pilates, Balance, and Yoga CORE STRENGTH - Ideal for strengthening core muscles and improving balance. Great for various workouts, from abdominals to Pilates VARIOUS USES - Assists with stretching for increased flexibility; Can double as a desk chair to improve posture and strengthen core ANTI-BURST- Durable construction provides anti-burst technology up to 2000 pounds for a long-lasting and safe fitness tool EASY TO INFLATE - Includes an extra air plug and an easy-to-use foot air pump to make inflating simple and fast 3 SIZES - Offered in 55cm, 65cm, and 75cm in diameter so you can get the perfect fit; Limited lifetime warranty included