... WM ,2.5MW ,3 MW ,6 MW etc .wind generator slip ring . 2. ISO 9001:2008 , BV , CE , ROSH etc . certified ... . 1. Products : We supply our carbon brushes , brush holders and slip rings for Shanghai Electric for many years , we have the good ... , if you want the high quality carbon brush , brush holder ,slip ring or you are now using these three enterprises' goods ...