Kneaded eraser

The kneaded eraser, also known as putty rubber, is a tool for artists. It is usually made of a grey or white pliable material (though it can be found in many different colors, ranging from green to blue to hot pink) and resembles putty or gum. It functions by adsorbing and "picking up" graphite and charcoal particles. It does not wear away and leave behind eraser residue, thus it lasts much longer than other erasers.