Make them yourself ……..
-4 vise grips
-2 lengths of insulated stainless braided cable (or welding cable)
-4 furrels
cut cable to desired length and strip ends back 3/4 of an inch
crimp furrels in place.
weld furrels to vise grips
mother of all jumper cables !!!

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2003 SLK 230 (85000)
1999 E300 Turbo Diesel (388,000)
1991 350SD Turbo Diesel (185,000)