Vascular Graft 2 (IMAGE) Virginia Commonwealth University Caption A scanning electron micrograph to illustrate the fibrous structure of the tube wall. The fibers are fewer than 500 nanometers in diameter, compared with the average hair shaft, which is 80,000-100,000 nanometers. Credit Photo courtesy of Scott A. Sell/VCU Usage Restrictions None 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.