Cork is an impermeable buoyant material. It is the phellem layer of bark tissue that is harvested for commercial use primarily from Quercus suber (the cork oak), which is native to southwest Europe and northwest Africa. Cork is composed of suberin, a hydrophobic substance.
Cork is the outer bark of the cork oak tree (Quercus suber L.). 100 percent natural, reusable, and recyclable, cork is, whether from the environmental, social, or economic perspectives, one of the world's most versatile materials.

Composition cork is typically used in decorative items and as a protective backing on novelty items on cork coasters, trivets, cork stoppers, wine stoppers, cork presents, cork leather, cork placemats, and more. A few of the most common applications for the composition of cork and cork granules include Bulletin boards, cork yoga mats, cork yoga balls, and cork yoga mats.