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Each item wire size comes in a set of 2 wires in 4 lengths (5′, 10′, 15′ & 20′). There are 3 wire sizes (4 AWG, 1/0 & 3/0). The fuse for each wire size is (4 AWG fuse=100 Amps, 1/0 fuse=200 Amps & 3/0 fuse=300 Amps).
There is a relationship between the wire size and the length that determines the max amperage the wire can carry. The longer the wire, the more of a Voltage drop. At 12 volts, the max voltage drop that is acceptable is about 1/2 volt. 1/4 volt would be best. Optimal would be within 3%, so for a 12V system the maximum voltage drop should be less than 12v x 3% (.03) = 0.36v.
Thor 3/0 Cable Kit comes in a set of 2 cables and 4 lengths to choose from.