You can remove the stains with metal polishing paste (not included). Copper Plate Supplier, Factory | Gangtuo We keep it simple and make sure you get the best for less. US Stock 2pcs 99% Copper T2 Cu Metal Flat Bar Plate 4mm x 15mm x 250mm Copper Plate For Electrical Projects QWORK Copper Plate T2, 3mm X 15mm X 250mm Cu Metal Flat Bar T2 Purple Copper Plate and are also suitable for additional heat dissipation of various computer chips. Dimensions: Thickness: 4mm, Width: 15mm, Length: 10cm Set of 2. High Purity: T2 purple copper plate is made of high quality copper with a purity of more than 99.95 Versatility: T2 purple copper plate has good thermal conductivity, toughness, corrosion resistance, easy hot and cold pressing, and can be made into tubes, rods, wires, strips, plates, foil copper materials. Choose Qwork, where your money works harder for you.