How do you say i have long black hair in french?

English : I have long black hair.

French : J'ai de longs cheveux noirs. -- "zhay duh loh[n] sh(uh-)vuh nwar"

or

J'ai les cheveux longs et noirs. -- "zhay lay sh(uh-)vuh loh[n] ay nwar"

[n] indicates that the previous vowel sound is nasal. Sounds in parentheses are optional.