The YIHUA Desoldering Nozzles Long Life are a must-have for any industrial and scientific setting... Based on our own experience, these nozzles are durable and long-lasting, making them cost-effective in the long run. they are easy to use and provide excellent suction power which results in clean and precise desoldering. The only downside we found is that they can clog when working with large amounts of solder, but this can be easily fixed with periodic cleaning. Overall, we highly recommend these nozzles to anyone working in the industrial and scientific field..