Using your Gemfan 3525 Hurricane 3-Blade Propellers is easy. First, make sure your drone is powered off. Then, select the right propeller (CCW or CW) and attach it to the motor using the 1.5mm mount or the included M5 adapters. Double - check that the propeller is securely attached before powering on your drone. When flying, avoid hitting hard objects as this can damage the propellers. For maintenance, after each flight, check the propellers for any signs of wear or damage like cracks or chips. If you notice any issues, replace the propeller immediately. Keep the propellers clean by gently wiping them with a soft cloth. Store them in a cool, dry place to prevent warping. With proper use and care, these propellers will serve you well for a long time.