I don't think the multi-strand is size 10. I thought I had some to compare from 100 years ago but I can't find it. I may be wrong but I think #10 is bedspread cotton. I'm going to watch this thread to see what the experts say. I did see someone's post on another site that said to put 3-4 strands of regular floss together to equal #10 but that was a tatting site...