Scrap metal prices Frederick, Maryland. Here are some examples of common non-ferrous metals we purchase: Copper is commonly sorted into five main categories: bare bright wire, #1, #2, light copper, and insulated wire. Insulated wire is sorted and priced based on the percentage of copper we can recover after the insulation is removed. Brass is typically sorted into two categories: red or yellow. Red contains roughly 10% tin and is becoming more rare. Aluminum is sorted into many different grades. The most common classes are extrusions, cast, siding, beverage cans, alloy wheels, and electrical wire. Stainless steel generally is found in one of two types: 304 or 316. Alloys with greater nickel