Fil-Tec Clear-Glide 15 Class Poly Filament - Tex 12 (60 wt.) Bulk Prewound Bobbins The ideal bobbin for domestic 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. White color with 145 yards per bobbin.