The round belt is for Eureka models 2000, 2100, 4000, 5000, and 6400 Series. 6 pack. Also, fits old-style modes 600, 800, 1400, and 1900. These belts also fit Powr-Flite uprights with round belts, Koblenz upright with round belts, and Sanitaire SC600 and SC800 series vacuums.