From the Manufacturer
This cup shape brass brush is non-sparking and softer than steel. It will not scratch soft metals like gold, copper and brass. For example: clean spark plugs, stainless steel stove tops, glass, electrical terminals, and flashlight contacts.
Product Description
Dremel 536 Brass Brush Dremel 536 Brass Brush Features: Brass brush Non sparking Softer than steel Will not scratch soft metals like gold, copper or brass Ideal for cleaning and surface finishing items made from gold, bronze, copper or brass Creates a soft, satin or matte finish Very effective on flat surfaces and in hard to reach areas like slots 1/2" bit diameter Carded