Our technical engineers went to their company. After inspection, they found that the models of the reducers they used did not match, and they used the old soft-tooth surface reducer. So they recommended them to the K-series hard-tooth reducer. The customer bought five sets, after one year, There is no fault at all, and the customer has been working with us for a long time. From 2016, I have learned from the customers that the five reducers have not had problems.