The ideal emblem edging thread, Merrowing Thread is designed for the Upper Looper in a Merrow MG-3U. Genuine Merrowing thread is colorfast, won't bleed, and has been tested and approved for sewing in the MG-3U. It is sold in large 1.25lb spools (approximately 4625 yards) and should be paired with like colored Needle and Inside Locking Thread to get the look of a true Merrowed Edge. The Outside Covering Thread will determine the color of your edge.