This drum support roller is offered independently. Most dryers call for two. The tri-rings are included. It is a drum aid roller for your dryer. It is actually a real substitute component. The component includes the drum roller only and would not incorporate the tri-rings. This part is offered individually. https://appliance-parts-in-markha61604.theisblog.com/29851096/what-does-furnace-filters-in-markham-mean