The MDS .40 Two Stroke Nitro RC Remote Control Airplane Engine with Muffler M2 is a high-quality engine designed for airplanes. This engine, suitable for ages 17 and up, features a ball bearing for smooth operation. With a displacement of .40, it is compatible with nitro and glow fuel and is designed for universal use with any brand vehicles. The inclusion of a muffler ensures quieter operation, making it a reliable choice for enthusiasts seeking power and performance in their RC airplane.