These are the most common types of pencils,

By marking material


Coloured pencils


Promotional pencils
Graphite pencils
These are the most common types of pencils, and are encased in wood. They are made of a mixture of clay and graphite and their darkness varies from light grey to black. Their composition allows for the smoothest strokes.
Solid graphite pencils
As the name implies, these are solid sticks of graphite, about the diameter of a common pencil, which have no casing. They are often called "woodless" pencils. They are used primarily for art purposes as the lack of casing allows for covering larger spaces easier, creating different effects, and providing for more economy as the entirety of the pencil is used up. They are available in the same darkness range as wood-encased graphite pencils.
Charcoal pencils
They are made of charcoal and provide fuller blacks than graphite pencils, but tend to smudge easily and are more abrasive than graphite. Sepia-toned and white pencils are also available for duotone techniques.
Carbon pencils
They generally are made of a mixture of clay and lamp black, but are sometimes blended with charcoal or graphite depending on the darkness and manufacturer. They produce a fuller black than graphite pencils, but are smoother than charcoal.
Coloured pencils, or pencil crayons
These have wax-like cores with pigment and other fillers. Multiple colours are often blended together.[52]
Grease pencils
They write on virtually any surface (including glass, plastic, metal and photographs). The most commonly found grease pencils are encased in paper (Berol and Sanford Peel-off), but they can also be encased in wood (Staedtler Omnichrom).[52]
Watercolour pencils
These are designed for use with watercolour techniques. The pencils can be used by themselves for sharp, bold lines. Strokes made by the pencil can also be saturated with water and spread with brushes.[52

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