A pencil is usually made with a piece of carbon mixed with clay that has a wood case around it. Coloured pencils are a type of pencil that instead of greyish silver, the tip is a different color. Coloured pencils or crayons are usually meant for drawing rather than writing.
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An eraser or rubber is an article of stationery that is used for removing pencil and sometimes pen writings. Erasers have a rubbery consistency and are often white or pink, although modern materials allow them to be made in any color. Many pencils are equipped with an eraser on one end. Typical erasers are made from synthetic rubber, but more expensive or specialized erasers can also contain vinyl, plastic, or gum-like materials. Other, cheaper erasers can be made out of synthetic soy-based gum.