Solid brass bristles won't rust or corrodeLarge, plastic utility brush has solid brass bristles that won't rust or corrode. Brass bristles are slightly softer than stainless steel and are therefore less intrusive to surfaces. Molded plastic handle provides solid, controlled grip. Bristles: 5/8"D. Overall length: 8 1/2". Molded plastic handle provides solid, controlled grip 5/8"L bristles Overall length: 8 1/2"