TORAY T800 Carbon Fiber Frame: The foldable Carbon fiber frame provides the portable folding bike with a structure that is uniquely strong and Lightweight (9.3kg/20.5lb).. Equipped with a SHIMANO SORA 3000 9-Speed Gear System & Hydraulic Disc Brakes: The SHIMANO rear derailleur features crisp, fast shifting and has a low profile design that protects it from damage. With the Hydraulic Disc brake you got great stopping power combined with high reliability right at your fingertips. Quickly and Easily Folds for Storage and Transport: Perfect for taking on a bus or train on your commute or stashing it in your apartment. Easy to Adjust: While only being 16" the portable carbon folding bike is suitable for almost all heights children because you can easily adjust the height of the seat for your own needs. Easy to Assemble: The Carbon Folding Bike is almost completely pre-assembled before packing and shipping. THREE YEARS WARRANTY ON FRAME and SIX MONTHS ON ACCESSORIES (Only available in condition for normal use).