The King Palm's are natural leaf rolls and are individually handmade.  All leaves are handpicked and use purified water to clean before they are rolled.  These leaves are very slow burning and resilient  If wanting to keep your leaves fresh for a very long time just keep them stored in a sealed case with 72% humidity and in a cool, dark environment.  These leaves were grown in farms across Southeast Asia and they are considered to be Natural because they were not grown with toxic fertilizers and not treated with pesticides or artificial chemicals.  Since these leaves are cut directly from the tree, new leaves appear after a short period of time.  These are the most eco-friendly leaves on the market.