Using these HQProp 5135V2 propellers is easy. Just attach them to your compatible device with the 5mm shaft. Make sure to match the CW and CCW props correctly for proper operation. When using, avoid hitting hard objects as it may damage the polycarbonate material. For maintenance, clean the props regularly with a soft cloth to remove dirt and debris. Store them in a dry place to prevent any damage. If you notice any signs of wear or damage, it's best to replace the propellers for optimal performance.