It is called Omegacryl! It is a thinner yarn, but it has such a fun texture and it comes in really vibrant colors. I got mine from TheNeonTeaParty.com!
Oooh. I'm not really sure how it would be labeled, but if you get the set with the two bigger ones, it is the larger of the two! It measures 3.4". I hope that helps!! ❤️