OEM Brush Roll Belt, also known as Centec # EB28010 and Nutone #1012B.
Poly V shapped belt fits many CT18 series power nozzles from Cen-Tec, Nutone (CT650) and older Airvac central vacuums. Some of the CT18DX & CT18DXQS models use instead the 40273 Geared/toothed belt, check your style before ordering.