This is the first ever Kitty String that invented. Favorite string of professional players all over the world, the KittyString 100% polyester. Almost same thickness as the other Polyester Brand of other Yoyo Strings. Good for all style of yoyoing. Most recommended even to the beginners. This polyester is softer than normal, producing a much smoother feel during play. They are between 110 and 115cm in length, so they are a good choice for those who like longer strings (of course, you can cut it to your preferred length). In anticipation of being cut to a specific length, these strings do not come knotted, so you must tie your own finger hole.