A break from the standard wooden coaster, this bamboo coaster set speaks volumes to the natural, sustainable values your company espouses. Bamboo is often mistaken for a tree but is, in fact, a grass. That gives it a unique grain that is both elegant and natural looking. It is also naturally microbial, containing bamboo kun, an agent that it produces to protect itself from harmful microbes and fungi. As a natural product, tone variations may occur. Hand washing recommended.