IRIS Fitness 12 kg. flywheel combined with the belt drive mechanism allows for smooth and quite workouts Adjustable resistance with press down breaking system Heavy duty steel frame with bottle holder; maximum user weight 100 kg Adjustable handlebars and fully adjustable seat with high density padding Adjustable Seat and Handlebar ：The seat can be adjusted for height and proximity to handlebars! With a simple twist of a knob, you can move back and forth so your workout can remain comfortable when riding for long periods of time. “Heavy-Duty Flywheel Operation The heavier the flywheel, the smoother the ride! Creating more momentum for longer periods of time keeps your workout going the distance like you are really riding outdoors! No more jerky, out of control movements, regardless of speed or resistance level! Comfortable and Adjustable seat. Foot Cage Pedals- Proper foot placement is essential to any biking workout! Ensure your feet are securely in the right place, Avoid foot slippage at increased levels of speed and intensity! Stay Hydrated and Healthy- The convenient bottle holder keeps your favourite refreshing beverage at arm’s length! No need to stop to sip. ..simply reach down and grab. Proper hydration will ensure your health and workout performance stay at optimum levels! Features: Durable frame. Ultra-comfortable PU sport saddle. Positive-locking seat post adjustment Top-down, easy-to-use resistance system.” Product information: Color : Black. Load capacity: 100 kg. Product size: 110 x 55 x 100 cm. Flywheel: 12 kg (two-way inertia) Transmission method: Belt. Resistance adjustment: Rotation resistance adjustment. Stand: Thickened stand in fitness quality. Handrail: Foam IPAD holder: One-piece PP holder Foot pedal: Adjustable non-slip pedal. Movable pulley: Easy to move bicycle belt pulley. Note: The assembly instructions of the spin bike are in Chinese language ,so buy if you are comfortable.