Answer:
I am a type of weapon for SCI-FI characters
I am bought by the yard but worn by the foot. What am I?
I have two eyes in the front and a lot of eyes on my tail. What am I?
If you look, you cannot see me. And if you see me, you cannot see anything else. I can make anything you want happen, but later everything goes back to normal. What am I?
What is the word that even in plain sight remains hidden?
No matter how little or how much you use me, you change me every month.