FIXPENCIL 0.7MM: Mechanical pencil with a light metal body, equipped with an eraser and a spare supply of leads with a diameter of 0.7 mm. In the late 1920s, Caran d'Ache introduced one of the first mechanical pencils, the Fixpencil. It's still going strong, as one of the most respected clutch pencils on the market. Like the company itself, the Fixpencil has evolved.