Thank you for viewing. This is a set of 5 vent filters. - Quantity: 5 filters - Product Name: Filter Please check the size on the cardboard box in the photo. I purchased these on Amazon for 1980 yen (as of February 2026), but they didn't fit, so I didn't use them. Would these be useful for pollen対策 (pollen allergy measures), etc.? I do not have any pets. The 5 filters came from Amazon in a plastic bag inside the cardboard box shown in the photo. For shipping, I will cut out the instruction section from the cardboard box and compress it for shipping, so please understand this before purchasing. Immediate purchase is OK. Thank you. Toyo Aluminum Filtan Allerblock Filter for Vents with Lids, Set of 5 Exhaust vent Ventilation opening Vent