It doesn 't say anything about the ply or weight. I unraveled a small part of the end to see how many strands are twisted. There were 4...but it is so thin. I know it's not worsted weight or sport weight. I put it up next to Patons Kroy Socks yarn, which is a "1" (superfine weight)...and it's a bit thinner than that. So...."0" weight is the only thing left.