Inspired by the stunning natural colours of gemstones, a unique collection of incense burners professionally crafted from American Ash Trees with its typical straight and smooth grain.The smart design is made to allow ventilation across the burner to keep it cool.Instructions:- Use 33mm or 40mm charcoal size (OUDCRÀFT Burning Kit is recommended)- Use Silica Grains The design also features a removable bowl to prevent the ash from falling on the table while burning. Careful attention has been given to the details to make your incense burning experience both safe and enjoyable.