For traction wiring you're going to want a super flexible high quality fine-stranded welding cable and, to show our commitment to completing this sentence, we've got it for a good price. For most DC applications, we suggest 2/0 for battery wiring, and 4/0 for motor wiring. AC and moderate-performance higher voltage DC systems can use smaller battery wiring. Standard pricing is by the foot, but we can cut any length. You want 37 1/2 inches? Call us! No cut is too small, but if you only want a half inch, we're really going to wonder what you'll use it for.