Using these Emax Avan Long - range propellers is straightforward. First, make sure your drone has a 2207 1900kv motor, as these propellers are best matched with it. If you're using a 4s battery, you'll get extended flight range. For a more aggressive flying experience, switch to a 5s battery. When installing, ensure the CW and CCW propellers are placed correctly on the drone. As for maintenance, after each flight, check the propellers for any signs of damage like cracks or chips. If you notice any issues, replace the propeller right away. Keep them clean by gently wiping them with a soft cloth. Store them in a cool, dry place to prevent warping or damage. Also, avoid high - impact crashes as much as possible to maintain their durability.