Answer:
One am I, among six others: Largest, smallest, cold, dark and two brothers
You can tumble in it, Roll in it, Burn it, Animals eat it, Used to cover floors, Still used beyond stall doors. Freshens whatever it is placed on, Absorbs whatever is poured into it. What is it?
Where can you add 2 to 11 and get 1?
What is it that no man ever saw, which never was, but always will be?
Kids play it and Michelangelo sculpted with it.
What sphinxes employ and players enjoy.