thatll work.
but im wonder why they have 4 gauge power, but 8 gauge ground. its suppose to be the same size going in the amp and going out.
edit: nm, i guess itll work if you use two amps. but if you are running just one amp, make sure whatever size goes in, comes out.
edit #2

: it doesnt say what size fuse is there. make sure you get the correct one in, for safety reasons. add up all the onboard fuse(s) on the amp(s), thats the size that should be near the battery.