Period product (IMAGE) Virginia Tech Caption A cotton gauze stockinette coil that is filled with the powdered biomaterial (at left). The powder-filled coil is then inserted in a menstrual cup (at right). Credit Photos courtesy of Bryan Hsu. Usage Restrictions Must courtesy 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.