Clear-Glide embroidery bobbins contain a high-tenacity polyester filament bobbin thread wound on a plastic flanged spool. This bobbin is designed for home sewing (drop-in) machines. Clear-Glide uses the same high quality poly yarn as Magna-Glide and will provide the operator with more stitches per bobbin which results in fewer bobbin changes. Each lint-free bobbin provides uniform tension, and the plastic sides will not bend. Works great with machine thread sensors. Plastic bobbins are not affected by humidity or oil. No uneven tension caused by distorted paper sides. More stitches per bobbin, saves you time.