Sizes go from (example #8AWG -#1AWG, small to large then the next larger size is 1/0 AWG to 2/0AWG and so on. I purchased my wire from Cable Yard and it is called Radiflex, it is awesome wire,very flexible. I ordered 1/0 but they were out and I went with 2/0 . If you are thinking about relocating your battery check out Madd Electrical.com. Great website and awesome electrical products. I bought his relocation kit and relays for headlights plus a few other things,great products and ifo on wiring your car correctly. Good Luck
Kevin
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