This is a set of two Fil-tan Allergen Block Filters for vents with lids. Simply insert them into your room's vents for easy installation. They catch allergens, pollen, and dust, keeping the air clean. They are compatible with 24-hour ventilation systems and measure approximately 16cm x 16cm. Although unused, please consider that they have been stored at home. [Brand] Fil-tan [Product Name] Allergen Block Filter for Vents with Lids [Size] Approximately 16cm x 16cm [Contents] 2 pieces of 1 filter each [Condition] Unused [Color] White系 (White-based) Thank you.