Lexmoto: Arrow 125 HT125-4F. Huoniao: HN125-4F. Haotian: HT125-4F. 1x Lextek Rear Sprocket 428-41T 4 Bolt Fixing (M8). 1x Lextek Front Sprocket 428-15T 156FMI 157FMI. IMPORTANT: This kit includes the front and rear sprockets fitted to the bike as factory standard, with the correct length chain included.