Wire Brush Set 3 piece Mini 10652 Truper. Nylon: to clean delicate parts without scratching or damaging them. Brass: to work copper, plastic, lead, aluminum, steel. For static reduction applications, does not generate spark when struck with other metal surfaces. Stainless steel: ideal for cleaning without contaminating, removing excess solder, rust, cleaning cast iron, to grind large flat areas in less time.