This drum aid roller is bought individually. Most dryers require two. The tri-rings are involved. This is a drum support roller for a dryer. It is a real replacement section. The section includes the drum roller only and does not include things like the tri-rings. This element is offered independently. https://samsungdryerpartsinajax16150.angelinsblog.com/29159148/examine-this-report-on-dryer-parts-in-stouffville