Koren pots and planters are a proprietary blend of ground marble, blended resins,  recycled material, and fiberglass. Know as fiber reinforced cultured marble, the planters are non porous and do not absorb moisture making them freeze proof. This blend also produces a planter that is half the weight of similar concrete planters. The casting we produce is also superior in terms of strength to weight ratio. At half the weight you save 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.