How to buy a premium ballpoint pen?

Premium ballpoint pens (ballpoint refills), must have the following characteristics.

1. must be equipped with a metal oil tube refill, the nib ball must be made of carbide? tungsten carbide ball, writing performance better than the general ballpoint pen, the ink infused in the refill must use the fixed-point production of 424 pure blue ink and 322 black ink. These two inks have the advantages of sunlight resistance, water resistance, and non-permeability. With these two types of ink refill ballpoint pen, can be used for archival documents writing (including plastic tubing refills, but the color of the tubing must be used light yellow tubing).

2. senior ballpoint pens in the pen set have obvious trademark brand and type mark, in the end of the refill also has an obvious brand, production date and "DA" mark mark ("DA" mark that the combination of the first letter of the two characters of the hanyu pinyin file).

3. in the packaging of goods, are trademarked brand, model, production plant name, origin and quality inspection certificate and other signs, marks. Counterfeit and shoddy goods, refills filled with ink is not the State Records Bureau approved archival ink, no "DA" mark on the refill, there is no trademark brand, model, factory name, origin, some are smuggled in with foreign unlicensed refills, assembled as imported senior ballpoint pen.