Robo is a quarter-moon abstract brass ring, a sculptural crescent form that wraps the finger in an organic arc, the abstract shape giving it the quality of wearable art. Also described as a moon ring or abstract sculptural ring for women. Sand cast in brass: the mold is made in sand, the metal is poured in hot, and the piece that comes out is always slightly its own. The brass is finished with a nano ceramic e-coat for superior durability and resistance to water, sweat, and tarnishing, without changing how the metal looks or feels. An invisible protective shield you wear, not a coating you see. Product Details Material: Solid recycled brass with nano ceramic e-coat Tarnish-resistant, water-resistant, hypoallergenic, nickel-free Ethically handcrafted by Fair Trade artisans Robo means a quarter in Swahili — one fourth of something, which is still significant. SKU: JR105A