Pilates Magic Circle, the official name should be resistance ring.This flexible and convenient exercise aid was invented by Joseph Pilates himself.The earliest resistance ring was made of a piece of metal wrapped into a circle, with wooden handles on each side of the outer circle serving as grips. The joint of the metal piece was secured with screws to one of the handles. Product Name: Pilates Ring Material: High-quality eco-friendly EVA foam + fiberglass Fiber + anti-slip striped rubber Color: blue, black, purple, green, rose red, gray Size: Approximately 40cm in diameter Applicable for: Yoga, fitness, weight loss, massage The following images were taken with a mobile phone, and color differences from the actual product are unavoidable. If this is unacceptable, please be cautious when purchasing!!! Product dimensions: 410*380*35mm Packaging dimensions: 420*420*70mm