These are the 16 oz. Polyester Zipper Bags used on most of the larger Torit Cyclones, including the Cyclone 24, 30, 36, and 44. These bags are equivalent to Torit part # 3EA-11695-02, which is a 16 oz product. These are superior to the 10.5 oz bag # P031831-016-210 in both filtration efficiency, and in service life. These bags are in stock. For the smaller bags used on the Cyclone 12, 13, 16, 19, and 20 please give us a call.