KittyString (NYLON) XL x10
With a completely different feeling from cotton and polyester strings, here comes the Nylon K-String.
K-String's main offerings are 100% polyester, but these strings are made from nylon (yes, the kind that windbreakers and stockings are made from).
The nylon has even more slip than polyester, and is even smoother for tough tricks that utilize layered mounts, causing less sleep loss. The nylon opens up beautifully for suicide catches and other slack-type tricks.
XL string is a little thicker than Fat, giving it a more responsive feel, for tight binds (which means your next throw is going to have some intense spin on it!).
*Nylon is more susceptible than polyester to melting, so avoid using this string with yo-yos that use a starburst response system, or fixed axle models. Friction can lead to injury, kids!