Using these Gemfan 5236 propellers is easy. First, make sure your drone is powered off. Then, carefully attach the CW propellers to the designated CW motor mounts and the CCW propellers to the CCW mounts. Check that they are securely fastened before powering on your drone. When it comes to safety, always keep your hands and any objects away from the spinning propellers. Don't fly in areas with a lot of people or near obstacles. For maintenance, after each flight, check the propellers for any signs of damage like cracks or chips. If you notice any, replace the propeller right away. Clean the propellers with a soft cloth to remove dirt and debris. Store them in a safe place, away from sharp objects that could scratch or break them.