This is a brand new OS MAX 25 R/C Cylinder and Piston, part number 22503003. It's a high-quality replacement part for radio control model vehicles. The OS MAX 25 is a renowned engine, and this cylinder and piston set is an essential component to keep it running smoothly. Crafted with precision and attention to detail, this part is designed to meet the highest standards for durability and performance. It's perfect for hobbyists and professionals alike, who demand the best from their RC vehicles. If you're looking for a reliable replacement part for your OS MAX 25 engine, look no further. This cylinder and piston set will ensure your vehicle runs smoothly and delivers maximum performance.