they come from japan, Okamoto brand and they are known as "zero zero four" or 004, they are .04 MILLIMETERS thickness. isnt that crazy ? i want to try but naturally they are a lot more expensive.
004 available link
it looks like they have one that is .03 too lol
and those are available at the link below
link
004 available link
it looks like they have one that is .03 too lol
and those are available at the link below
link