Polyester filament thread on plastic flange bobbins, ideal bobbins for domestic & embroidery machines. Clear-Glide bobbins are wound on a plastic-sided bobbin shell. Because of this, they are not affected by humidity or oils. They are responsive to machine thread sensors so you don't have to worry about your yardage. Clear-Glide offers more stitches and yards per bobbin than both competitive and machine-wound bobbins. Contains 100 bobbins.