Set of 4 large high-quality threads for large projects: This set includes 4 large polyester thread spools, each with 5000 meters, totaling 22,000 meters. It is an economical solution to ensure enough threads for larger embroidery and sewing projects without continuous rethreading. Thread spool design with locking: Each 5000M thread features an innovative large locking base, designed to prevent slipping during fast sewing and embroidery, ensuring smooth and tidy thread feeding without the need for additional accessories. Strong and vibrant thread: Made from 100% trilobal polyester thread with a standard weight of 40, this second-generation thread offers superior strength, beautiful sheen, and vivid colors for professional results. For optimal performance, a sewing speed of 600-800 stitches per minute is recommended. Multidimensional color conversion: These 5000M polyester embroidery thread packs are designed to be compatible with Brother and Madeira color systems, providing easy color adjustment for various embroidery designs. Note: Home embroidery machine users are advised to consider using a spool/support base for optimal thread delivery.