The ring is made of durable fiberglass with a rubber outer sleeve and will not permanently bend or crack. The fitness ring always keeps its shape even after the most strenuous exercises, turning back into a circle with dimensions diameter: 38 cm Ideal for various fitness activities - the Pilates rings can be used to burn belly fat and upper arms, inner and squeeze outer thighs, abdominal and back muscles. Increases flexibility, mobility and endurance Ideal for general exercise and Pilates. Training without heavy weights. Our fitness ring is light and powerful, with a moderate resilience that fits perfectly with your overall body workout. Whether you are a beginner or an advanced user, the Magic Exercise Circle is only suitable for standing, sitting and lying down. The magic pilates circle is perfect as a mobile training device for the office, studio or travel in a carrying case. Exercise anytime, anywhere you want. Product Description: 100% brand new, very durable and practical. Ideal for people who want to keep in shape and health . If you want to exercise at home. Can try Pilates. Feature: Size: 38cm. Material: Rubber and fiberglass. Features : high quality, durable, stylish Type: Pilates Rings. Sub-Type: Yoga Exercise Rings The Package Includes: 1 x Yoga Ring Notes: 1. Please allow slight differences in size due to manual measurement, different measurement methods and tools. 2. The picture may not reflect the actual color of the item due to the light, angle and display monitor difference .