This is the RCGF STINGER 10cc RE Rear Gas Two Stroke RC Remote Control Airplane Engine, perfect for those looking for a powerful and reliable engine for their airplane. With features like ball bearings, this engine is sure to provide smooth and efficient performance. This engine is compatible with various scale sizes, from 1:18 to 1:10, and is suitable for use with gasoline. It is also non-domestic and not modified, making it a great option for those who want a consistent and trustworthy engine. So if you're in need of a high-quality airplane engine, look no further than the RCGF STINGER.