An eraser is an item of stationery that is applied for erasing pencil marks, and some types of pen writing. Most erasers are made of rubber(TPR), plastic, gum, vinyl, or some similar materials. Traditional erasers's shapes are very simple, they only have function of removing pencil marks. However, modern eraser materials allow them to be any color, any shape and any size, therefore, they gradually have the use for decoration, display, promotion, gifts and collection purpose, etc. Used by students and children as well as office workers, erasers are becoming more and more popular nowadays, because of green and eco-friendly materials and various shapes and color.