Olga, you don’t say what you are using - silk? If so, I believe
size 0 is .30 mm? Not sure.
Soft Touch wire comes as fine as .010 and is 7 strands of micro
stainless steel but only comes in silver. Soft Flex (same company)
is a little less supple, smallest size is .014 and comes in various
colors. Hope this helps, and here is a link to their site for some
specifics if it does. http://www.softflexcompany.com/
Nancy - Iowa