Zeekio did it again. The Zeekio Sidewinder Diabolo is premium quality diabolo at an unbeatable price. It's great for all levels. The shells are made of a special plastic compound that allows for flexibility and strength with just the right amount of sponginess. With an all metal construction aluminum inner hubs and steel axle you can't break this baby.!Specifications:Height: 4.75” (120 mm) Diameter: 4.25” (108 mm) Weight: 6.8 oz (195 g)Axle: FixedNote: All of Yoyosam's diabolos come with sticks, string and instructions.