A mechanical pencil (US English) or propelling pencil (UK English), also clutch pencil, is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" /ˈlɛd/. The lead, often made of graphite, is not bonded to the outer casing, and can be mechanically extended as its point is worn away. Other names include automatic pencil, drafting pencil, technical pencil, click pencil, pump pen, pump pencil, leadholder, pacer (Australian English), pen pencil (Indian English), and lead pencil (Bangladeshi and American English).
Mechanical pencils are used to provide lines of constant width without sharpening in technical drawing and in quick, neat writ
3Ds Max 2017, Vray 3,6
MAX, OBJ, FBX