Mechanical pencil leads in a limited range of diameters (0.5 mm, 0.7 mm, or 2 mm) for their own products. Koh-i-Noor makes mechanical colored pencils with replaceable leads in 2.0, 3.15 and 5.6 mm sizes. Mechanical pencil 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" . 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 microtip pencil, automatic pencil, drafting pencil, technical pencil, click
Lead Pencil Studio that "...The billboard promises, 'Your Own Piece of Blue Sky!' The wall text tells us the artists are exploring the complex systems involved in the production of space. In other words, advertising dominates the view." Lead Pencil Studio Lead Pencil Studio is the working name of the art and architecture collaborative founded in 1997 by Annie Han and Daniel Mihalyo in order to cooperatively pursue installation art, site-specific art and functional architecture. They are winners of the 2007 Founder's Rome Prize in Architecture from the American Academy in Rome, and were recognized in 2006 as an 'Emerging Voices' by the