Koren pots and planters are made of Korestone,  a proprietary blend of ground marble, blended resins,  recycled material, and fiberglass. Korestone planters are non porous and do not absorb moisture making them freeze proof. This blend also produces a planter that is only 25% weight of similar concrete planters. The casting we produce is also superior in terms of strength to weight ratio. At a fraction of the weight there is a considerable savings on shipping.    We use only the highest quality materials to hand make our urns and planters. The unique formula yields a casting that is more authentic in appearance and will out preform any other planter you can buy.