Using these Gemfan Freestyle 4S 5136 propellers is straightforward. First, make sure your device is turned off before installing the props. Align the 5mm shaft of the prop with the corresponding part on your vehicle and secure it tightly. When flying, start in an open area to get used to how the props perform. Always check the props before each flight. Look for any signs of damage like cracks or chips. If you find any, replace the prop right away. To keep them in good shape, clean the props regularly with a soft cloth. Store them in a cool, dry place to prevent warping. Don't expose them to extreme temperatures or harsh chemicals, as this can damage the polycarbonate material.