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