Answer:
Long and thin red within with a nail at the end.
*forward* *backwards*is what I do all day. I come in all different shapes and sizes. I can be scary and I can calm you down.
I can be driven but have no wheels. I can be sliced but still remains whole
What is that you will break even when you name it?
I produce wool and spit a lot
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.