Not neutral pen industry people basically do not know, many different styles, it refills neutral pen manufacturer materials can be divided into oily neutral pen and water pen two classification.
Oil neutral pen can also be called ball pen. The use of ball pen ball made of hard alloy material, the bead diameter is 1mm, 0.7mm, 0.5mm three. The pen pen and ink is in neutral oil advertising pigment, solvent and adhesive mixture. Ballpoint pen refill colors are black, blue and red 3 choices. Ordinary ink is generally used to write, special ink used for file writing. The first generation of ball pen has been more than 70 years of history, the current production technology has become increasingly mature.