Thread nets are used for two main purposes - to avoid thread looping while you are embroidering, AND to stop thread from unwinding when it's not being used. In both cases, thread nets solve the problem easily and effectively. If you are using metallic thread, thread nets are a must. You probably won't be able to embroider normally without them.
You may purchase thread nets in different packs - 1 Dozen, 24 nets, 50 nets and 100 nets packs. Each net is approx. 6-inch long, so it fits both 1100 and 5500-yard cones. You can easily cut Thread Nets on half to get size for your embroidery thread cone. It will not unravel.