pen
Pen is a widely used writing tool, which was invented at the beginning of19th century and designed by American Walt Man. The pen is made of metal, and the writing is smooth, elastic and quite smooth. On the mouth of the pen cap or the surface of the pen tip, there are obvious trademark numbers and models. It is divided into dip pen, fountain pen and ink bag pen.
pencil
Pencil is a special pen for writing and sketching, which has a history of more than 400 years. Among them, pencil for sketch is divided into various types, which are divided into three development stages: graphite, wooden pen holder and pencil with cap; In addition, its colors are red and white, black and white, yellow and black stripes.
eraser
Eraser is stationery made of rubber, which can erase traces of graphite or ink. There are many kinds of erasers, with different shapes and colors, including ordinary erasers, special erasers for art, such as 2B, 4B and 6B for painting, and plastic erasers.
ball pen
Ballpoint pen is a kind of pen that uses tiny rotating balls, which are made of brass, steel or tungsten carbide, and can release ink to paper when writing. Ballpoint pen is very different from its predecessors reed pen, feather pen, metal nib pen and fountain pen.
straightedge
Rulers are widely used in mathematics, measurement, engineering and other disciplines. A ruler with a precise ruler. Rulers are used to measure straightness and flatness by light gap method, and can also be used to check length and size together with measuring blocks.