grey to black. Their composition allows for the smoothest strokes. Pentel has marketed synthetic resin bonded graphite for mechanical pencils since the introduction of its Hi Polymer lead in 1960, and it also sold wood cased graphite pencils such as the Japanese Black Polymer 999 (CB100), described by a retailer as using a carbon graphite "resin core".

Solid

Solid graphite pencils are solid sticks of graphite and clay composite (as found in a 'graphite pencil'), about the diameter of a common pencil, which have no casing other

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