These are our Premium Quality brand new SUPER Shine cones of POLYESTER Threads for Machine Embroidery. If you have problem where your machine keeps breaking the threads at high speed then you will need these threads. Then you need to use our super shine and super slick Polyester Threads. These will not break with any Machine. Polyester threads are much more stronger than the standard Rayon Embroidery threads and have a beautiful sheen. You can use this on any machine whether it be Brother, Singer, Jukki, Pfaff, Husqvarna or any other, these threads will not break when running at high speeds.