Compatible with for HFT600 Series, HEV-600 Series: HEV615, HEV615B, HEV615W, HEV620, HEV620B, HEV620W, HEV-615, HEV-615B, HEV-615W, HEV-620, HEV-620B, HEV-620W. High-quality materials: The blue humidifier filter has a diamond-shaped grid structure to the maximum water delivery and water absorption of the product. The newly upgraded blue grid appearance enhances the performance of the product and further ensures the cleanliness of the product. Colour: blue Material: wood pulp paper Package Contents: 4 x Humidifier Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. for Humidifier HEV615 Humidifier Filter Humidifier HEV620