Quality product, aggressive, balanced and ready to use. An old relative of "el cheepos". Except for the occasional flyby, you won't be showered with tiny metal darts, although it's wise to wear goggles at all times. I am removing old school 100 year old steel casement windows to replace them. We are talking about decades-old paint and rust deposits. I use these brushes to get into the corners. Like blister cleaning on steroids, these guys get the job done, leaving a gently polished, paint-ready finish perfect for priming. They don't last forever but compared to the junk I've used I have nothing to complain about.