Cork is a natural material, it can withstand high temperatures making it an ideal tableware companion. But, given its natural properties, it should also be treated with care: do not submerge it in water or put it in the dishwasher. Gently wipe clean with a damp cloth. Each piece is made from 100% organic cork bark leftovers and slightly burnt before pressing to get this particular color and finish. Each cube is varnished with a thin layer for protection to ensure durability.