Description: Features: Material made from filter cotton, good quality. Suitable for USB Water Bottle Caps Humidifier. Help the machine to Diffuse Mist and Purify. Can be sheared in shorter you need. Low temperature resistant. Can be Used to filter water. Low temperature resistantfilter water Filter cottonCan be sheared Diffuse Mist and Purify Filter Cotton Sticks only ,other accessories demo in the picture is not included. Directions for replacement: 1.Unscrew the water tank cap 2.Pull out the filter plastic part(notice the sprint on the bottom) 3.Pull out the filter and replace the new filter 4.Pull in the filter plastic part(notice the sprint on the bottom) 5.Screw the water tank cap Specifications: Material: Filter Cotton Color:White Quantity: 20pcs/1set 7mmx115mm Diameter0.7cm Length:11.5cm 8mmx70mm Diameter0.8cm Length:7.0cm 8mmx120mm Diameter0.8cm Length:12.0cm 8mmx130mm Diameter0.8cm Length:13.0cm Note: 1.No retail package. 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 20 x Filter Cotton Sticks