IronStone is a material that is exclusive to Robert Allen. Robert Allen IronStone planters are hand crafted from upcycled automotive steel. Pressed into shape and spun into a one-piece planter, there are no seams or welds - which means no leaks or rust. Carefully powder coated with a triple-layer finish, these planters are covered with a base coat, a hand-brushed texture coat, and a glossy clear coat to produce an exquisite high shine finish. With padded feet and a rubber-plugged hole for optional drainage, IronStone planters are ideal for indoor/outdoor use. Lightweight and unbreakable, they are easy to handle when filled with wet soil. Robert Allen IronStone planters feature a three-year warranty with virtually no claims history.