... CE certificate 2.Steel rim or aluminum alloy rim 3.Size: 16", 18", 20", 24" 4.Color; Red, blue, chrome,etc U-18A (18", Double ... Aluminum rim ) Features: 1) Size: 18" 2) Materials: Double Aluminum rim, chromed frame (made from steel tube ... ' FCL, 1580pcs/40' HQ 18 inch Unicycle with support stand,Double Alum rim(CE certificate)