Pencils are widely used in drawing because of their narrow construction and solid core that provides careful detail and intricate markings. They leave behind a trail of material, most commonly grey or black. The inside is made of a graphite and clay mixture which can be easily erased making this a universal design tool for any skill level. Historically pencils have been known as the go-to instrument in schools but the benefits extend far beyond the classroom. They are also a popular choice for engineers, architects, and artists alike. Other types of pencils include colored pencils which are not as erasable, and grease pencils and charcoal pencils which tend to smear when an eraser is used.
Background information and history of pencils.