General description These 250-Pack Car Diffuser Sponge Refill Sticks are designed for use in ultrasonic humidifiers and diffusers. Made from absorbent cotton, these filter wicks help maintain optimal performance by ensuring proper airflow and moisture distribution. Technical specifications Size: 2.75 inches (length) x 0.31 inches (diameter) Material: Cotton Package Contents: 250 x Humidifier Sticks Cotton Filter Sticks Measurement allowed error: +/- 1-3 cm Installation Soak the filter stick completely before inserting it into the humidifier for better performance. Can be cut to fit your specific diffuser or humidifier if needed. Usage Replace the filter every 3-4 months, depending on usage and quality of the essential oils. If using essential oils regularly, replace the filter every 3-6 days. Ensure the diffuser is not blocked to prevent overheating and potential damage.