DefinitiveYoyoing.com has posted the second part in their series on yoyo response, giving an in-depth breakdown on all the ins-and-outs of yoyo string. Well worth a read, so head on over and check it out!
Unlike everything else about a yoyo, the string itself has seen the least amount of change. The modern yoyo string starts out as a type 8 (4×2) 100% cotton string. The next large trend in string was the Slick 6 (3×2) 50/50 cotton/poly blend. Now the gold standard is the type 6 (3×2), 100% polyester string. It has not been until recently that small indie string companies have opened up, trying out different things. The vast majority of yoyo string, however, fall under the above three types, and over 95% of them come from the same factory too.