Experience smooth, reliable stitching with Prym’s rotary bobbins—designed for high-end and industrial sewing machines using rotary or double-rotary bobbin hook systems. Compatible with top brands like SINGER, PFAFF, and DÜRR KOPP, these durable bobbins come in your choice of long-lasting metal (5-pack) or lightweight transparent plastic (4-pack) for easy thread visibility. Available in two sizes—21.2 mm x 9.2 mm and 21.9 mm x 9 mm—they offer seamless compatibility and low-maintenance performance for all your sewing projects.