Features: Compatible with car air cleaner. Quick and easy to install, no tools required. High efficient filter removes very small dust particles, pollen and other allergens. Effectively helps to filter fine particles in the air to prevent second contamination. Easy to detach and it's recommended to change every 3-6 months. Specifications: Material: Activated Carbon Color: As picture Size: Approx. 100*100*10mm / 3.9 * 3.9 * 0.39 Package Weight: Approx. 23g Package List: 1 x Filter Note: Please note that the back color of this product will be sent randomly, and make sure you will not mind before ordering. 1Compatible with car air cleaner 2Quick and easy to install, no tools required 3High efficient filter removes very small dust particles, pollen and other allergens 4Effectively helps to filter fine particles in the air to prevent second contamination 5Easy to detach and it's recommended to change every 3-6 months