Colour assorted pre‑wound bobbins designed for Singer Class 15 systems. Ideal for embroidery, quilting and everyday sewing where coloured bobbin thread is desired. Reusable clear bobbins make thread levels visible and keep colours organized for quick swaps. Use only with machines specified for Class 15 to maintain correct tension and stitch quality. For best results, test on a scrap first and match tools to fabric weight and machine class for consistent results.