These blue belts certainly wont make you blue when you pull out your wallet, as they're one of our most cost effective abrasives. The long lasting aluminum oxide grain leaves an excellent finish on non ferrous metals, wood, and composite materials. They also work well for slack belt sharpening on knives and axes. If you're looking for a more budget line of belts for the applications where a ceramic or trizact is overkill, these are a great option!
We wouldn't recommend these for finishing steel with a platen or wheel behind it, as we've found that the 347fc Trizact belts suit that application much better.