With this bow, you don't have to upgrade again for a very long time. It's perfect not only from it's playing characteristics, but craftsmanship, stick material, everything. What you need to do is to practice more, and take care not to damage it. Only limited 1 year restore and rehair service is available with this bow in our workshop. You can contact your dealer for how these services work. What is the second grade pernambuco wood we use to make this bow, check out pernambuco grades.