GENUINE OEM FILTRATION - PROTECT YOUR MOTOR - FEEL THE DIFFERENCE - Hyperflow central vacuum bags are the best choice for associated MD Central Vacuums. Incredible contruction and material that allow for excellent airflow dynamics and effective filtering all the way down to .3 microns. These are not typical paper bags but more like quilted felt yet very strong and durable. Don't settle for anything less! Silent Master, Modern Day, MD, Air-Flo, and Stor-Vac central vacuums will perform better and have longer motor life. Fits all top emptying vacuum units over 34 inches tall.