The product is steel. It is sold as earrings in 3 different sizes. The inner diameters of the hoop earrings are 12-15 and 17 mm, respectively. Bar thickness is 1 mm. Color change is minimized - durability is at the highest level. It will not darken or fade unless exposed to excessive moisture and chemicals. When not in use, it should be stored in dry, closed and moisture-free environments. Since it is a hygiene group product, it is not suitable for exchange or return.