Colour White Material Cotton Power source Usb Powered Sufficient quantity: you will get 40 pieces white humidifier filter wicks, each one is approx. 13.5 cm/ 5.3 inch in length and 0.3 inch in diameter, enough quantity to meet most of your needs; Practical tools for office, room and travel use Good water absorption: the humidifier filter stick is characterized by good elasticity, uniform pore distribution, strong water absorption, good storage capacity and volatilization stability Quality material: the humidifier stick is made of filter material, insoluble in water and not easy to stick, supports most kinds of perfume, liquid and other water solvents, help your humidifier work better Easy to use: humidifier wicks are simple to remove and install, allow you to finish installation in few seconds, please soak a filter stick to be wet completely before inserting to the humidifier; It is recommended to use tap water and don't drip in essential oils to be soaked (if necessary, adding a small amount of essential oil is acceptable) International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.