Mineral oil
Chore Boy copper scrubbers are made of 99.997% pure copper. Mineral oil is used to draw, spool, and unspool the copper wire. In addition, it helps to make the manufacturing process easier and protects the wire from scratches during use. These scrubbers are recommended for cleaning copper and aluminum cookware, broiler pans, barbecue grills, stove burners, and oven racks.