This is used and sold as is. it did come off a running saw that was stripped for parts. It's compatible with models 023, MS 230, MS 250, and 025. Includes a piston and cylinder, making it easy to replace worn or damaged parts and get your chainsaw back in working order. With a 2-stroke engine type and gasoline power source, this kit is designed for optimal performance. It's made by STIHL, a trusted brand in outdoor power equipment.