The Sunny Health and Fitness Premium Yoga Ball Small 55CM - Sf-EB02-s is designed for individuals 4'8"" - 5'5"" tall and works best with desk heights of 28-30 inches. This versatile ball enhances core strength, posture, and balance while supporting low-impact exercises for all fitness levels. Made from durable Pvc, it features anti-burst technology, a non-slip surface, and a 660 Lb weight capacity for safe and reliable performance. Perfect for yoga, Pilates, physical therapy, prenatal exercises, and more, it s also ideal for balance training, stretching, strength workouts, cardio, or as an active sitting desk chair to promote better posture and core engagement. Trusted by physical therapists and trainers, it s a great tool for improving stability, flexibility, and endurance. Easy to inflate with the included pump and accessories, the ball comes with clear instructions for hassle-free setup.