Green Pig w/100% Natural Bamboo Charcoal Freshener For You To Use Around The House,Kitchen or Car And Office to Keep Clean Smelling and Fresh.Beautiful and Attractive Angry Bird Design Comes Both Functional And Decorative. Size: 20cm High x 18cm Width. Bamboo Charcoal is Known to Have High Porosity. Various Impurities or Foreign Matter Will be Absorbed Over the Wide Surface Area of The Charcoal. When Air Passes Over, If The Humidity is High, The Charcoal Will Absorb The Moisture and The Air Will be Converted to Dry Air. If the Air is Too Dry, Then the Charcoal Will Discharge its Own Moisture, Thus Adjusting the Humidity in The Air.