Answer:
I am rubber you can eat!
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
I can never be stolen from you. I am owned by everyone. Some have more some have less.
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.