Answer:
Tear one off and scratch my head what was red is black instead. What is it?
I am a sound made by felines when petted.
My rings are not worth much, but they do tell my age. What am I?
I may be of the eye, in order I am pie. In my center there is a star, I keep medics where they are. What am I?
What has keys but no locks a space but no room and you can enter but can't go in?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.