This brush is great for what I'm using it for.  Cleaning up the live edge on a slab of mango.  If you have any uneven edge, this will get it cleaned up and along with the other grits will take you from rough to finish.  The bristles are impregnated with an abrasive and are nylon so it won't leave those pesky metal wires all over.  Made in America and a little expensive but it's worth it.