Using your T-Motor T3140 propellers is easy. First, make sure your device is turned off. Then, simply attach the propellers to the appropriate mounts on your equipment. For CW and CCW propellers, ensure they are installed in the correct orientation. When using, avoid flying in extreme weather conditions like heavy rain or strong winds as it can damage the propellers. For maintenance, after each use, check the propellers for any signs of wear or damage. If there are small nicks or scratches, you can still use them, but if the damage is significant, it's best to replace them. Store the propellers in a cool, dry place away from sharp objects to prevent accidental damage.