Toyo Aluminum Room Vent Filter White, Approximately 20x20cm, Catches PM2.5 and Pollen, Allerblock Filter, 5402, 2 sheets x 3 packs (Not sold individually) #ToyoAluminum #Filtan #SpringCleaning There are sticker removal marks on the outer package. Brand new, unused. For pollen and dust対策. Easy installation, just stick it on the wall vent. Anti-allergen filter that also catches PM2.5. Product size: Approximately 20 x 20cm Number of sheets: 2 sheets Weight per sheet: 5g Material: Anti-allergen processed polyester fiber Country of origin: Japan