Using these HQProp J37 propellers is easy. First, make sure your device is turned off. Then, carefully attach the propellers to the appropriate slots on your machine, matching the CW and CCW propellers correctly. When you're using the device, keep an eye on the propellers. If you notice any strange noises or vibrations, stop using it right away. For maintenance, clean the propellers regularly with a soft cloth to remove any dirt or debris. Store them in a dry and safe place when not in use. Don't expose them to extreme temperatures or harsh chemicals, as this can damage the polycarbonate material.