- 10 pieces white humidifier cartridges included; sufficient quantity to meet most needs for office, room and travel use. - Good water absorption: flexible filter rod with even pore distribution, strong water absorption and water storage capacity, providing stable evaporation. - Quality material: filter rod made from filter material, water insoluble and not easy to stick; supports most perfumes, liquids and other water solvents, helping your humidifier work better. - Easy to use: filter cartridge is easy to disassemble and install, taking only seconds. Soak the filter rod before inserting into the humidifier. Use tap water; do not soak in essential oils, though a small amount of essential oil is fine if necessary. - Use scenarios: in the office to maintain comfortable humidity during long workdays; at home to improve air quality in living rooms or nurseries; while traveling in hotels to keep rooms pleasantly humid.