This is 4 feet (1.2 meters) of wicking material. It can be used to pull tuning slides and for buffing in those hard to reach areas and a few other things. If you use it for buffing, you will also need the correct buffing compound (not included).
Here is a link to a video of how to use this for valve tuning slides:
“How To Remove Stuck Valve Tuning Slides” https://youtu.be/rPYhVFxcMoY