Used but in good condition. Allows you to turn your bike into an indoor spin bike in only a couple minutes. Here is a description from the manufacturer:Smooth,realistic accelerations. Reliably consistent resistance. Long-lasting performance.The JetFluid Pro's patented design channels 100% of intake air to efficiently cool the resistance unit and maintain a consistent power curve while the individually precision-balanced flywheel eliminates "dead weight" and maximizes inertia. So what does that mean for you? Road-like performance, pure and simple.Call 785-766-2259 for inquiries.