The KingsBox Black Gymnastics Rings are made of durable plastic and have a steel core inside. They are designed to suit both the grip of men and women. The long polyester straps resist all weather conditions and hold up to 1.5 tons of weight, which gives you the chance to safely perform all types of exercises. With this product, you will add instability to all movements, which will make your workout much more effective as your body will be forced to activate multiple muscle groups at the same time. With this product, you will have the possibility of a complete workout, at a minimum cost!