Each tumbler is made from one solid piece of oak that has been carefully selected for its qualities and longevity. Quality and careful selection of the wood is perhaps the most important part of the process. The oak needs to be solid and compact as oak is a long fiber wood with gaps to allow it to breath but pieces with larger gaps need to be selected and removed. Each tumbler is a work of art with subtle differences between very piece. The tumbler is specially shaped to expand towards the bottom to allow greater vapor expansion and better expansion of complex aromas as you drink.