Must See Before buying: between 3.5-4mm thick, non-fixed thick, the cracks in the Horn after wearing are normal, this is the "smile pattern" of the horn. Please be careful if you cannot accept it, most customers who buy horn products believe that they are all for good health and health care, which can be understood. Horn is a special product cutin. If there is any problem with the product on the day of receipt, it can be reissued or returned. If the horn crack occurs after wearing it, it cannot be returned or exchanged. Please note