40 pieces white humidifier filter wicks - Each wick is approx 10 cm (4 inches) in length and 0.3 inch in diameter - Compatible with most portable personal USB mini humidifiers - Please confirm your device length and diameter before purchase Key benefits - Sufficient quantity and correct size for easy replacement to maintain performance - Good water absorption with elastic structure for reliable operation Material and performance - Made from filter material that is insoluble in water and not easy to stick - Supports most kinds of perfume, liquids and other water solvents - Helps your humidifier work better by ensuring effective humidity delivery Extend humidifier life - Replace the filter with these humidifier sticks when the device produces less steam, stops, or overheats - Prolongs the life of the humidifier - Usually change the filter every 1 to 2 weeks for optimal performance Use scenarios - Home or desk use: place in a USB mini humidifier on a work desk or nightstand to maintain comfortable humidity and, if desired, disperse fragrance from compatible liquids - Travel or hotel: carry with a portable USB mini humidifier to keep your personal space humidified and fresh in different environments - Small office or dorm room: quick replacement to sustain steady humidity levels and improve air feel in compact spaces