Using these HQProp T3x3x3 propellers is easy. First, make sure your device is turned off before installation. Align the propeller with the shaft and gently attach it. When flying, avoid areas with strong winds or obstacles to prevent damage. For maintenance, after each use, check the propellers for any signs of wear or damage, like cracks or chips. If you find any, it's best to replace the propeller. Store the propellers in a safe place, away from sharp objects that could scratch or break them. Also, keep them in a dry environment to prevent the polycarbonate material from deteriorating.