The wood used to craft our essential oils holders is hand selected from our amazing west coast and each piece has its own unique personality with natural flaws and imperfections. We do not attempt to hide this natural beauty. The pieces are hand-rubbed with Tung oil and polished with carnauba wax to protect and bring out the natural beauty of the wood. Tung oil is pressed from the seed of the nut of the Tung tree, and leaves no residue. Carnauba wax is non-toxic and is derived from the leaf of a South American palm tree. It is an ingredient found in many food and pharmaceutical products.