10 Gage? That's good for charging a battery - but not jumping - too much I^2R losses - aka, you hook them up, and wait, say 15-20 minutes or more while your battery charges, and then try to start the car

Personally, I think 4 gage are a bit light!! I took some old welding cables and made my own - they are ONLY 0 gage (light welding cable) - a lot more flexable than regular cables too