Velishy(TM) Hepa H12 H13 Filter Fit for Electrolux Harmony Oxygen Canister Vacuum Material: plastic, Color: Blue Size: 150 mmLengthx 120mmWidth x 25mm (Height) For best results, filters should be replaced every 2 - 3 months Filters maintain Nepa's cleaning performance while reducing infiltration of dust, pollen and other allergens into the air you breathe Package Included: 1 x Filter