three keys jewelry 4mm black tungsten carbide wedding ring for women with koa wood inlay domed wedding band engagement ring comfort fit size 3.5 three keys jewelry our tungsten carbide rings are most suitable wedding band ring, excellent daily wearing, wedding, engagement and anniversary gift for men and women. tungsten carbide wedding rings are the newest trends in jewelry, not only because they are known as one of the hardest metals, but also they retain the exact polish for many years to come. tungsten carbide is roughly 10 times harder. if you are looking for a ring that is scratch proof and forever keeps its shine, then our tungsten carbide rings are ideal for you.we provide life time service to this ring covers issues that were built-in to product itself, excluding the damage caused by buyers themselves.unique logo design concept and brand (best wedding band and anniversary gift) three keys jewelry consists of three keys with symbol meaning together, which represents hope(star), love(heart ) & good luck(four leaf clover)separately. and they are together to unlock the door of wealth, health & love. few tips to make sure each guys can get correct and ideal item at quick time! tip 1: do not touch hard object with ring due to tungsten fragile feature; tips 2: pls directly contact amazon customer service for exchanging ring size issue, because amazon control exchange, return and refund issue for fba listing! tips 3: pls directly contact us if you have any problem about item issue, we seller will help you solve it at quick time until you guys are 100% satisfied with our solution.