The air filter is used for refrigerator to help reduce the odor and bacteria, replacement for W-hirlpool W10311524 refrigerator. Features: Effective at keeping refrigerator fresh and odor free. The air passage through the filter can actively help neutralize odor and bacteria. Filter should be changed every 6 months. 15 times more useful than baking soda. Carbon-based material reduces common food odors. Replacement for W-hirlpool W10311524 refrigerator. Specifications: Material: Paper + Active Carbon Color: Black & White Quantity: 1Pc, 2Pcs, 4Pcs (optional) Item Size: 77 * 46 * 14mm / 3.30 * 1.81 * 0.55in Item Weight: 1Pc: 10g / 0.35ounces 2Pcs: 20g / 0.71ounces 4Pcs: 40g / 1.41ounces Package Weight: 1Pc: 11g / 0.39ounces 2Pcs: 22g / 0.78ounces 4Pcs: 44g / 1.55ounces Package Size: 1Pc: 77 * 46 * 14mm / 3.30 * 1.81 * 0.55in 2Pcs: 77 * 46 * 28mm / 3.30 * 1.81 * 1.1in 4Pcs: 77 * 58 * 37mm / 3.30 * 1.81 * 1.46in Package List: 2 * Air Filter