[Filter Sticks Size] 0.31 (Diameter) x 2.75 (Length) inches. You can cut it to fit your diffuser/humidifier if needed. [Replacement] We advise customer to replace the filter after 3-4 months of use (depending on the usage and quality of the). [How to Use] To see better performance, we advise user to soak a filter stick completely and insert it into the humidifier. [Benefits] Extends the life of the diffuser: If the diffuser/humidifier is always fully blocked or half blocked, it will become hot and break easily, we strongly recommend you to use water solubility and . Usually 1-2 weeks, replace the filter or easily connect the machine. If you use essential oils regularly, you need to replace them every 3 to 6 days. Size: 7 cm in length and 0.8 cm in diameter Material: cotton swab Color: white Package Contents: 200 * Humidifier Sticks Cotton Filter Sticks (excluding other display items) Only the above package content, other products are not included. Note: Light reflection and different