Aluminum pens are pencils. Aluminum pen is a kind of pen specially used for writing, painting and sketching. Aluminum pens have a history of more than 400 years, and there are many types of aluminum pens used for painting and sketching. Aluminum pens are divided into three stages of development, including graphite, wooden pen barrels, and capped pencils. In addition, the colors of aluminum pens include red and white, black and white, yellow and black stripes. With the extensive use of aluminum pens, a series of problems with traditional aluminum pens have been exposed.