NOTE: This is for the 4.2L YJ.
Fine-strand, SAE (Society of Automotive Engineers) approved copper cable, copper terminals crimped and sealed with marine grade heatshrink. Also included are military style corrosion resistant battery connections and an ANL fuse and holder. Every end will be labeled for ease of installation.
2GA or 4GA? Which to choose?
As far as 2GA vs 4GA, it's really going to depend on what mods you're going to do to. If you're staying stock, then 4GA is plenty, but if you're looking at modifying it down the road (winches/lights/etc) then you'd want 2GA, and we all know a Jeep is never really *done*.