The product is a vintage O.S. 40 Four Stroke R/C model airplane engine that is brand new in the box. This engine is specifically designed for airplanes and is compatible with radio control vehicles. Ideal for hobbyists and enthusiasts, this engine offers a classic four-stroke design for reliable performance in model airplanes. With its high-quality construction and beautiful appearance, the O.S. 40 engine is sure to enhance the flying experience for hobbyists looking for a vintage-inspired option.