Fil-Tec ClearGlide Black "L" Embroidery Bobbins provide excellent stitch quality in home sewing machines. These lint-free bobbins use a high-tenacity polyester filament wrapped around flanged spools for more stitches per bobbin and uniform tension. The robust plastic sides will not bend or lose shape, and they come in black, white, and select colors. Upgrade your sewing machine for fewer bobbin changes and superior results. These plastic bobbins are not affected by humidity or oil, ensuring consistent tension throughout the entire project. Additionally, they feature a wide range of colors and fit in most standard home drop-in machines. With up to 20% more stitches per bobbin, this product will save you time and money.