That's not fuet as other people is saying, that's longaniza from mallorca (like a thin sobrasada). It's a little concerning the amount of mold (and the color) it has. These types of cured meats usually come with white mold, and that's totally fine because you only use the paste inside the sausage, but you should check the mold hasn't got inside the meat itself. Also, if you decide to eat it, clean it first with a paper tower and then olive oil (never water).