Extreme Motorsports of California, Inc. manufactures sand rails, desert and dual sport racecars for off-road racing. Its products include Sandmaster Sandcar, Dune Racer Sandcar, MD Sandcar, Desertmaster Prerunner, Mid Travel Beam Car, and Dune Racer ST Beam Car. The company was founded in 1983 and is headquartered in Bakersfield, CA.