[Cotton swab size] 0.32 inches (about 0.8 cm) in diameter x 3.99 inches (about 10 cm) in length. Suitable as a replacement filter rod for portable mini humidifiers with 500 ml capacity. Can be trimmed to fit other humidifier models if needed. [Advantages] Made of high-quality fiber cotton. Offers strong water absorption to support proper humidifier function. Serves as an ideal replacement filter element, helping extend the lifespan of your humidifier. [Replacement] It is recommended to replace the filter every 3 months, depending on usage and water quality. [How to use] Soak the filter rod in water for 1 minute before initial use to ensure full saturation. Color: White Material: Fiber cotton Size: 8x8x100mm Package Contents: 20 x Humidifier filter sticks Note: The package includes only the items listed above. Other accessories are not included. Note: Slight color variation may occur due to lighting and display differences. Measurement error allowed is +/- 1-3 cm.