Set of 3 easy-to-apply seals for outdoor vents with filter function. Normally comes with 2, but this is a bonus pack with an extra one. It seems this product has been discontinued. How about preparing for the upcoming pollen season? Compatible models: Vents (outdoor side) With round cover Round type Hood type Please check the last photo. - Brand: Filtan - Application: For outdoor vents - Features: With filter function - Size: Approximately 21cm x 21cm - Quantity: 9 sheets Unused, unopened. Regular price: 495 yen/piece Total: 1485 yen Stored at home. I'm selling these as I don't have a chance to use them. Instant purchase OK. Due to the size, I will ship them with only waterproof packaging, without bubble wrap. Please be aware of this before purchasing.