Answer:
Weight in my belly trees on my back nails in my ribs feet I do lack.
I must be broken before you can use me. What am I?
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
When you buy me I am costly, but the only use I have is hanging only. What am I?
I am shared by goats devils and unicorns.
I am rarely touched but often held. If you are smart you'll use me well. What am I?