Guttural roots contain a guttural consonant (such as alef, hey, het, or ayin in any position; or resh as the second letter). Hey as the third root is usually a hollow root marker due to being a vowel spelling rather than one of any consonant, and is only considered a guttural root in the third position if historically pronounced. Alef root-initially and root-finally takes on a somewhat divergent conjugation similar to that of hollow roots, but is usually identical to other gutturals. Of the three classes of weak roots, guttural roots are the most common.