Theragrippers On a Swab (IMAGE) Johns Hopkins Medicine Caption A theragripper is about the size of a speck of dust. This swab contains dozens of the tiny devices. Credit Johns Hopkins University. 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.