Bare copper wire #4 awg solid is a standard wire that WesBell keeps in stock. It has no insulation or jacket. We mostly stock the soft drawn bare copper but also offer the hard drawn upon request. If you need insulation on the wire please take a look at our Electrical Wire, Hook up Wire and Teflon wire for different types of jackets. WesBell also offers FREE SHIPPING over $250.00 to anywhere in the continental USA. Please call for all your wire and cable needs because we stock a lot more than we're able to put on the website!