Pens made of metal are heavier, because they are stronger than resin, so they will be heavier. It will be tiring to write with a metal pen for a long time, so it can be used for collection and signature. Pen is a writing tool with metal as the main body. Broadly speaking, pen is a widely used writing tool. It was invented at the beginning of19th century and designed by American Walter Mann. 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. If it is divided into dip pen, fountain pen and ink bag pen according to the water absorption method, attention should be paid to maintenance and cleaning when using it.