Answer:
What can be heard in court or used to carry briefs?
I am black within and red without; with four corners round about. What am I?
My voice is tender my waist is slender and I'm often invited to play. Yet wherever I go I must take my bow or else I have nothing to say.
No matter how little or how much you use me, you change me every month.
At night I come without being fetched, and by day I am lost without being stolen. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?