First Class Fat - 100% Polyester - 10 Pack of Strings A favorite string of professional players all over the world This has 12 strands of thread but still makes a good whip and slack. Strings are between 120 and 125 cm in length. These strings do not come knotted, so you must tie your own finger hole. Kitty String is a world-class yo-yo string company that provides premium quality yo-yo string First Class Fat - 100% Polyester This is the thicker version of Normal at the same time heavy String among Kitty String. This has 12 strands of thread but still makes a good whip and slack. Most slackers like this Type of String. Many yoyo players use this for wide gad yoyo which giving it a more responsive feel, for tight binds (which means your next throw is going to have some intense spin on it). Strings are between 120 and 125 cm in length, so they are a good choice for those who like longer strings. In anticipation of being cut to a specific length, these strings do not come knotted, so you must tie your own finger hole.