THEY ARE ALL CHOCOLATE BRANDS BY "MARS".
CAPTAIN AMERICA - VIBRANIUM
THE WOLVERINE - ADAMANTIUM
URU IS A METAL ORE THAT HAS BEEN USED TO MAKE THOR'S HAMMER "MJOLNIR".
SIMILARLY, CAPTAIN AMERICA'S SHIELD IS MADE UP OF VIBRANIUM AND WOLVERINE'S SKELETON IS MADE UP OF ADAMANTIUM.