Clear Glide Bulk Pre-wound Class L 125yd Bobbins No. 60 Filament Polyester. The ideal bobbin for domestic machine, 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.