Includes a Package of (1) Genuine 38528-034 Roller Brush Belt and (1) 38528-035 Power Drive Belt for Hoover Windtunnel models with the Self-Propelled feature. Replace these belts every 6 months to ensure optimum performance.. Package of (1) Genuine 38528-034 Roller Brush Belt and (1) 38528-035 Power Drive Belt for Hoover Windtunnel models with the Self-Propelled feature. Replace these belts every 6 months to ensure optimum performance.Hoover