Nylon Kitty String is like the usual Fat Kitty string you know and love, but made of nylon, which is more durable, slightly stiffer, and has a very different feel for slack and loop tricks.
Fat Kitty String has 12 strands instead of the usual six. This fatter string will give your yoyo more response so is great for beginner-intermediate players perfecting their bind technique. Fat Kitty String is also great for slack tricks and for counterweight / freehand play. It is also a great choice for people who want to guarantee a nice tight bind so that your next throw is as powerful as possible even with a wide unresponsive gap or konkave (string-centering) bearing.