Finish: 18K Gold plated Waterproof: does not change color from water exposure Lead and nickel free Material: Stainless steel, zicorn (waterproof!) Size: 13x22mm (adjustable) Weight: 5.8g All our jewelry are made of stainless steel material. For the gold pieces, we added an 18K PVD gold plating. This means the colour will last for a really long time (at least a few years). It will not fade easily and it's also an anti-scratch material.All our products are made of stainless steel, soโฆ