FilTec ClearGlide 15 Class Poly Filament Tex 12 60 wt. Bulk Prewound Bobbins The ideal bobbin for domestic machines, ClearGlide bobbins are wound on a plasticsided 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. ClearGlide offers more stitches and yards per bobbin than both competitive and machinewound bobbins. White color with 145 yards per bobbin and 80 bobbins per box.