Boar Hair (IMAGE) Cell Press Caption This image shows boar hair, which has a diameter of over 200 nm and breaks in a normal fracture mode. The breaking surface is relatively clean with no obvious delamination of the cortex fibers. Credit Wen Yang Usage Restrictions Credit Required License Licensed 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.