2 Pieces 99.9% Pure Copper Sheet, 4″ X 4″,18 Gauge(1Mm) Thickness, Film Attached Copper Plate, Great for Jewelry, Crafts, Modelers. 2Qty 4″ x 4″,18 Gauge(1mm) Thickness Quality Pure Copper Plates. Each copper has protective sheet(blue) on both sides, which protects the surface of the copper from scratches or damaging.