Features: No other tools needed, easy to intall and remove. Helps protect dust cleaner from dirt that causes damage. This filter is specifically designed to purify the most of air conditioning. Easy to replace and disposable-, no tools required. Replace every 6 months for optimal- performance. 4 standard for your option: 23x23cm/30x30cm/45x150cm/45X250cm. Specifications: Material: polyester Thickness: approx 5mm Size: approx 23x23cm/30x30cm/45x150cm/45X250cm(optional) Note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 10xAir Conditioner Filter with Magic-hook( 23x23cm/30x30cm) Or 1x Air Conditioner Filter with Magic-hook(45x150cm/45X250cm)