The O.S Engine MAX 50SX-H Ring Hyper L is a high-quality 2-stroke engine designed for helicopters, for nitro and glow fuel. Manufactured by OS, this engine is perfect for RC enthusiasts looking to upgrade their helicopters with a reliable and powerful engine. With its new boxed packaging, this engine is sure to be a popular choice for those seeking top-notch performance and durability in their RC hobby. Aluminium helicopter fan included. Any questions, please ask