Pure Fitness 8615FB is a versatile fitness tool that can help you achieve your fitness goals. With its 55cm size, it is suitable for users ranging in height from 5'1" to 5'7". The exercise ball is made of durable material that can withstand up to 350 lbs of weight. It is easy to inflate using the included hand pump and can be used for a variety of exercises, including yoga, Pilates, core strengthening, and balance training. The ball's anti-burst design ensures that it will not pop unexpectedly, even if it is punctured.