This thickness is the best to take memos while thinking. Until now I have used aqueous fountain pens, but now I am able to fix it, this is one choice. It is regular sale at regular stationery shops and home centers, but it is good to buy cheap at a cheaper price in monotalou (We are buying a bundle.).
I am using it for checking products. It is very convenient to erase immediately even if you make a mistake. Moreover, it is not used for storage, but it is used as temporary one. As a product, is it because of the solvent that the reduction of ink is felt earlier (thinner)? I think that there is a type of knock type (there is something that has lost the cap).