Well made brass wheel and cup wire brushes; brass wire indeed, not brass plated as many say it is brass; creates an almost polished finish on brushed metal objects; does not leave scratches on the processed surface; especially good for softer metals like copper/brass/aluminium; the ability to work with a brush at speeds up to 4500 rpm; haven't lost any conspicuous wire brushes yet; the wire is firmly held in the center of the wheel or cup; meets and in many cases exceeds expectations; when they wear out I will definitely buy again; highly recommended products.