Thank you for visiting our ebay store! Two self-tightening propellers (black) for use with Autel Robotics X-Star and X-Star Premium Drones. Package includes one red-topped propeller and one silver-topped propeller. – Two self-tightening propellers (Black) – Package includes one red-topped propeller and one silver-topped propeller – Compatible with Autel Robotics X-Star and X-Star Premium – Propeller dimensions are 9.4″x5.5 Degree – Original Autel Robotics parts Autel Robotics Propellers for use with X-Star and X-Star Premium Drones, Black