Using the DAL Fold 2 F7 folding propellers is straightforward. Just attach them properly to your device according to the CW and CCW directions. When transporting, the folding design allows you to easily carry them around without worry. As for maintenance, keep them clean after each use. Wipe off any dirt or debris gently with a soft cloth. Avoid using sharp objects that could scratch the propellers. Store them in a cool and dry place to maintain their durability. And always check for any signs of wear or damage before use. If you notice anything wrong, replace the propellers to ensure safe and efficient operation.