Superior Threads So Fine 421 Marigold is a premium polyester thread offering 3280 yards of smooth, vibrant color perfect for machine quilting, piecing, and general sewing projects. The fine weight and high yardage make it an economical choice for both small and large projects while maintaining consistent quality and color coverage. So Fine thread is known for its strength and reliability, gliding smoothly through most machines without tension issues. Available at Glory Bee’s Sewing Center in Fallston, MD.