The cork stoppers I offer are non-agglomerated, meaning it is natural and untreated. It does not have any glues and is a whole piece of cork. Cork Bark is actually made from the same trees as cork, but is from younger trees and contains more of the layers than cork stoppers do. This makes it a bit more of a chewing challenge than cork stoppers.
Mahogany fruit pods are about the same density and chewiness as cork. They are have naturally speckled and striped appearance, especially on the inside!