Review on 300-Pack Steel Wire Brush Set With Rotary Tool Accessories - Rocaris Wire Wheels, Pen Brushes Kit For Improved Cleaning And Polishing by Jim Escobedo

These are overall just very poor quality. While they appear decent, the wire used for the bristles is too brittle. The bristles very quickly Crack and shed from the brush. They don't come loose as they are all still attached in the head, just broken off yet above where they are crimped.