Singer XL-6000 Accessories Sew & 6x10 Embroidery Machine XL6000 Auto: Tension, Self Winding Bobbin, Threader, Cont. Hoop, Format Convert, PC Cable

Singer Exclusive Endless Bobbin-Provides continual bobbin winding during embroidery. If the bobbin runs out of thread, the XL 6000 stops, rewinds the bobbin until it's full, and resumes stitching exactly where it left off.