I don’t really know I haven’t used them but poly string is usually fairly thin. The type 6-10 usually represents thickness. 10 being the thickest. 6 is like average type string for non loopers. If you believe it to be too think you can go up types. They normally increase in thickness since normally there is more cotton woven into the string. Hope this helps.
Actually the lenngth is the only difference here. this is pure polyester so there i no cotton. the 3x2 is standard thickness that most ppl use and prefer(i do anyways) but if you think it’s 2 thin you go up to type 8 ot type 10. these higher types are thicker and therefor have reponse which is why more advanced players stick with type 6 and stau unresponsive