Think they are 6 gauge multi strand with heavy coating. Don or others will confirm for sure.
Engine cables (factory installed) are 6ga (Marine-Tinned) cables.
If extending beyond the length of these cables (such as installing a battery switch)- I'd recommend using 4ga tinned cable between the switch and the battery.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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Okay thanks for the help guys!