Image 2 (IMAGE) National Research Council of Science & Technology Caption Schematic diagram of silicon nitride bearing balls for electric vehicle drive modules Credit Korea Institute of Materials Science (KIMS) Usage Restrictions The sources of photos and research results from KIMS must be specified. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.