As an industrial and scientific user I'm always on the lookout for reliable consumables for my plasma cutter. After I put these alumina ceramics to the test, I was impressed with their durability and precision cutting capabilities. They also come at a great price point compared to other brands on the market. The only downside is that they are not easily found in local hardware stores, so i had to order online. Overall, I highly recommend these consumables for anyone in the industrial power tools field..