Answer:
Who works when he plays and plays when he works?
I have legs but never walk, I may have flowers but no soil, I hold food but never eat.
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
In marble halls as white as milk, lined with a skin as soft as silk. Within a fountain crystal-clear. A golden apple doth appear. No doors there are to this stronghold, yet thieves break in and steal the gold.
Kills the bad ones and the sad ones. Tightens to fit, so one size fits.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.