Exercise unicycle 16",18",20",24" Steel rim or aluminum alloy rim Color; Red, blue, chrome,etc U-16A (16", Aluminum rim) Features: 1) Size: 16" 2) Materials: Aluminum rim, chromed frame (made from steel tube) 3) Fork: Clamp type, electro-plated or painted finish 4)Hub: Electro-plated or painted finish, ball-bearing 5) Crank: Electro-plated steel 6)Pedal: 3x3/4" in length, steel + ABS 7)Tyre: 16" ...