So Fine! #50 is a smooth, strong polyester thread from Superior Threads that you’ll love using on your longarm quilting machine or domestic sewing machine. This 50 weight thread was designed specifically for high speed quilting machines. So Fine! #50 is lint-free and has a lovely matte finish. This skinny thread is super forgiving and sinks into your quilt, letting your fabrics shine and providing excellent texture! Cotton lovers will enjoy how this polyester thread looks and feels like cotton, all without the frustrating thread breaks and linty bobbins. You can use it for your top thread when you want your fabric design to be more prominent or it also makes a fantastic bobbin thread.