SENSAH EMPIRE carbon fiber 2x12-speed road bike shift kit front and rear Derailleur + shift lever + flywheel + chain. Material: aluminum / carbon fiber / rubber. Chain: KMC chain (12 speed). Flywheel:11-34T flywheel (12 speed).Tip: The 2X12 transmission can be used with 11-speed road chainrings and 11-speed hubs. And only to Lower 48 states. We will provide a best resolution for you. Pls do not open a return request before contacting us!