Features: Great training ring set for soccer, football, basketball and practically all other sports. Place on the ground and training your leg muscles. Made of practical material, durable and lightweight. Great endurance and muscle-toning workout. Specifications: Item type: Training Ring Material: Plastic Color: Red+Blue+Yellow(each color have 4pcs) Exterior ring diameter: about 40.5cm Inner diameter: about 37cm Quantity: 12pcs/set. Package includes: 12pcs/set x Training rings Notes: Transition: 1cm=10mm=0.39inch 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement.