MATERIAL - Made of professional PVC, soft and durable, anti-burst and anti-slip. Stay flexible and soft when fully inflated and stay in place during yoga, Pilates or physiotherapy exercises. . SIZE - Diameter in 23 cm / 9 inches Pink and Purple. . SAFETY - Factory tested as durable and blast resistant to 80kg so you don't have to worry when training.Factory tested as durable and blast resistant to 80kg so you don't have to worry when training. . MULTIFUNCTIONAL - Perfect for various activities, such as yoga, Pilates or cross-fitness, to regulate muscles, increase aerobic endurance, improve strength and control weight. In addition to exercise, it can be used for posture correction, abdominal development, recreational therapy, sitting at a desk, pregnancy and childbirth support activities. . AFTER-SERVICE GUARANTEE - Prompt customer service with satisfactory and patient response in 24 hours, money back guarantee. .