Answer:
I am an animal and a hair product
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
What is the musical part of a turkey?
I am as hard as metal, yet as flimsy as glass. I shine like a star, yet I am only a rock. What am I?
I am a kind of coat that can only be put on when wet.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.