The BERNINA Threading Kit Overlocker/Serger, along the instruction manual , simplifies threading and helps to adjust the optimal seam. Includes (5) five different spools of 1000m quality thread. The colors of the quality threads in the kit reflect the colors used for the threading paths on the BERNINA sergers. This way it becomes immediately apparent in the seam which thread tension values need to be changed. After completing the adjustment, high quality threads of the matching color for your project can be tied, pulled through and off you go! This threading kit is ideally suited for educational purposes as well as for self guided learning of the overlocker.