Найти ошибку в предложении. Is the leather used for making these

Is the leather used for these shoes good?

When corrected, this sentence should read, Is leather used for these shoes well?. The only two possible corrections that were мейд are The Definite Article "the" exclusion not to refer to a particular material that shoes were мейд from and adjective good was switched with adverb well because of its interrogative meaning.