These curved cleaning tools are a game changer for anyone in the industrial and scientific cleaning industry. They are sturdy, efficient and make tedious cleaning tasks a breeze... The ergonomic design allows for easy handling and the brass bristles are gentle enough to not damage surfaces while still providing a thorough clean. The only downside is the higher price point compared to other options in the market. Overall, TILAX Set is a great investment for anyone serious about getting the job done right..