The Arm Conditioning Energy bar is a tool that my good friend Dr. Dale Dugas from https://www.daledugas.com/ requested. It's a loadable 3" tube with a 3" hemisphere on one end for grip work and a cap for loading on the other. Dale is a master in acupuncture and Chinese medicine. I get my Iron Palm liniment from him.
This is used when loaded to roll on the arms/forearms and can be used for all types of grip work as well.