Cross' products include fountain, ballpoint, and rollerball pens, mechanical pencils and refills. Many ballpoint and rollerball retractable pens employ this type of bistable mechanism. Products manufactured by Lamy include fountain and ballpoint pens. Multipens are pens that feature multiple varying colored ballpoint refills. Ballpoint pens are produced in both disposable and refillable models. For these early drawings, Soejima used a notepad and ballpoint pens. In 1955 the company bought the ballpoint pen manufacturer Paper Mate. It usually refers to a narrow elongated staff, similar to a modern ballpoint pen. Color availability and sensitivity of ink to light are among concerns of ballpoint pen artists. Using ballpoint pens to create artwork is not without limitations. Marcel Bich was involved in developing the production of inexpensive ballpoint pens. Effects not generally associated with ballpoint pens can be achieved. Following World War II, many companies vied to commercially produce their own ballpoint pen design. Although designs and construction vary between brands, basic components of all ballpoint pens are universal. Kelley writes his first drafts longhand using a Bic ballpoint and yellow legal pad.