Description: Material: This Yoga Ball Chair is made from PETG material, ensuring sturdy and safe. The yoga ball can withstand up to 250kg, while the chair with the ball can support up to 150kg.Design: The chair is blow molded for a lightweight and easy to shape texture. It features an ergonomic backrest, a heightened front baffle, and imported omnidirectional wheels for maximum comfort and mobility.Feature: This yoga ball chair effectively improves posture, adjusts body shape, corrects sitting posture, coordinates the spine, strengthens core exercises, enhances body coordination and promotes a training back. It's suitable for yoga practice and fitness routines at home or in the office.Easy Installation: Simply insert the chair bracket into the base slot of the chair; tighten screws at the bottom of the chair; push omnidirectional wheels into small holes at base until locked in place; place yoga ball on top to use.Product Details: The chair with dimensions of 52cmx79cm for yoga ball seat; 55cm diameter yoga ball suitable for individuals between heights of 155cm to 175cm. Specification: Material: PETG Size Chart: Chair:52cmx79cm/20.47inchx31.10inchYoga ball diameter: 55cm/21.65inchSuitable for height: 155cm to 175cm/61.02inch to 68.90inch Package Includes: 1 Yoga ball seat1 Backrest4 Omnidirectional wheels2 Screws1 Yoga ball1 Air pump Note: Please allow slightly errors 1-2cm differences due to manual measurement.