Loro non avevano di barbe, né di capelli, né di sopraccigli.

Spanish Translation

No tenían barba, pelo ni cejas.

How do you explain the use of “di” here?

English Translation

They had no beards, no hair and no eyebrows.

Hi. In the sentence source for this sentence they have " Loro non avevano ne’ barba, ne’ capelli, ne’ sopracciglia". Looks like they did not finish their attempt to correct this sentence.