Modern Formula One cars are mid-engined, hybrid, open cockpit, open wheel single-seaters. The chassis is made largely of carbon-fibre composites, rendering it light but extremely stiff and strong. The whole car, including the driver but not fuel, weighs only – the minimum weight set by the regulations. If the construction of the car is lighter than the minimum, it can be ballasted up to add the necessary weight. The race teams take advantage of this by placing this ballast at the extreme bottom of the chassis, thereby locating the centre of gravity as low as possible in order to improve handling and weight transfer.