Using these DalProp T5146.5 Racing Propellers is easy. Just make sure to attach them securely to your racing equipment. When you're using them, keep an eye on the performance and adjust as needed. As for maintenance, regularly check for any signs of damage like cracks or chips. If you find any, replace the propeller right away. Also, clean the propellers after each use to remove any dirt or debris. Store them in a dry and safe place to avoid any accidental damage. That way, you can keep enjoying their great performance for a long time.