An eraser or rubber is an article of stationery that is use for removing pencil and sometimes pen writings. Erasers have a rubbery consistency, and they are often white, brown or pink although with modern materials they can be of any color. Many pencils are equipped with an eraser on one end. Typical erasers are made of synthetic rubber, but more expensive or specialized erasers can also contain vinyl, plastic, or gum-like materials. Other more inexpensive erasers can be made out of synthetic soy-based gum.