When you want both convenience and quality, Sulky's prewound bobbin thread is a 60 Wt. continuous filament, polyester, plastic-sided bobbins that are virtually lint free. It is the perfect weight for most every sewing, quilting, or embroidery project. "A" Style Tubes have a PURPLE label on the tube and they contain 4 bobbins with 110 yds. per bobbin.