Copper Bar

Where can I get a copper bar time?
I am currently designing a crank electric generator. I'm in the need for a son are few long piece of copper (a thin, making it malleable and easy to fold) and the only type of copper that I found online that is used for wiring. Does anyone know of a site, a good confidence that I can buy a copper bar?
I can not think of any generator design would require a copper bar or copper cable. Why not use a heavy copper wire, they come in all thicknesses of up to half an inch in diameter. Isolated or not. But a crank generator can generate a few tens of watts of power, which is more effective with relatively small wire. Each house will have power over all sizes. For the liquidation of a generator, he wanted "child magnet that is insulated with layers of varnish. Email me for more information ..