Heavy duty, pure copper for maximum current flow and tinned for corrosion resistance and easy soldering. Closed end to seal out moisture. Includes: (10) 8 AWG, 5/16″, (10) 8 AWG, 3/8″, (10) 6 AWG, 5/16″, (10) 6 AWG, 3/8″, (10) 4 AWG, 5/16″, (10) 4 AWG, 3/8″, (10) 2 AWG, 5/16″, (10) 2 AWG, 3/8″, (5) 1/0 AWG, 5/16″, (5) 1/0 AWG, 3/8″, (5) 2/0 AWG, 5/16″, (5) 2/0 AWG, 3/8″.