This set includes 12 pre-wound plastic bobbins, each with 80 yards of white 100% spun polyester thread. Designed for professional-style embroidery and free-motion embroidery, these bobbins offer a user-friendly, fast, and convenient solution for your sewing projects. The bobbins are compatible with most top and front load embroidery machines, excluding models MB4, 1600P, 1600P-QC, 1600P-DB, and 1600P-DBX. Each bobbin provides reliable performance, making it easy to maintain consistent stitching and high-quality results. Ideal for a variety of embroidery tasks, these pre-wound bobbins streamline your workflow and ensure you have plenty of thread on hand for your creative projects. Whether you're working on detailed embroidery or large projects, this pack offers a practical and efficient threading solution.