Sufficient quantityyou will get 40 pieces white humidifier filter wicks, each one is approx.10 cm/ 4 inch in length and 0.3 inch in diameter, compatible for most portable personal USB mini humidifier, please make sure your length and diameter bef Extend the life of humidifiercome and replace the filter with humidifier sticks, when the humidifier produce less steam or even stop work and even become more and more hot, prolong the life of the humidifier (usually 1 to 2 weeks to change the fi Reliable Materialthe humidifier stick is made of quality cotton, and it has the fine characteristics of trustworthy elasticity, strong water absorption, satisfying storage capacity and talented volatilization stability, ensuring the normal operat Easy Operationthe mini filter refill sticks are simple to remove and install without taking much of you time, you could soak a filter stick to be wet completely before inserting to the humidifier by using tap water, a simple way for you to instal Applicable Occasionthe humidifier filters sticks are very necessary for you if you have to use the humidifiers, and they are very useful for ensuring the humidifiers work properly, so you can put them in most places for replacing needs