Clear-Glide - Class L  - Light Grey This 8 pack Bobbins, 60wt. filament polyester, Class L 60wt. filament polyester thread used for sewing, quilting and embroidery. Introducing our premium Slide Size L Bobbins, designed for precision and reliability in your sewing projects. These high-quality bobbins ensure smooth, consistent thread flow, reducing interruptions and enhancing your crafting experience. Perfect for both amateur and professional sewers, our Slide Size L Bobbins are a must have for achieving flawless stitches every time.