Answer:
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
The 8 of us go forth and back to protect our king from a foes attack
Lighter than what I am made of, more of me is hidden than is seen. What am I?
I am known for my natural tuxedo and marching. What am I?
I have numbers on my face but can't find 13 any place. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.