... .7 MM / 1.0 MM (blue/black) and so on all sorts of colors.3. Metal pen material: brass, aluminum, steel, iron ... .6. Pen surface color:black,silver,red, blue,can according to the customers' requirements.7. Because the metal material price indeterminacy. So ... price affordable quality. Also we supply plastic ballpoint pens, promotional metal pens, roller pens, plastic pens, wood pens, fountain pens, laser ...