In order to provide high quality service for you, please fill in the contents of the buyer information correctly and then confirm the information. We will freely provide 1 gram of graphene / oxidized graphene powder or 200 ml of graphene / oxidized graphene water dispersion. There is only one chance for each company. Through effective communication, the customers confirm the quality of products and know the potential problems existing in the use process. In addition to providing products, OBO is not responsible for the problems existing in the use process.