These bicycles are the BEST! They are all aluminum, all screws are stainless steel, stainless chain, stainless gears, silicone handles and seat, drum brakes, built-in power generator for lights and charging phone, front basket, and the best part about these bikes are the airless wheels - never get a flat tire. These bikes are made in Germany for the rental business - $920 a piece originally. They are slightly used and are in good condition.