Bowjax Smaller RizrJax Black 2 pk Made by Bowjax RizrJax in Black 2Pk After extensive testing and the development of the monsterjax, the R&D department at Bowjax has come up with the new RizrJax. We've been getting asked by customers and bow companies about the best solution for taking vibration out of the bow riser itself. If you've got a bow with some vibration, throw on some RizrJax and notice the difference. *RizrJax ll Dampeners fits cut out smaller holes up to 1 in width*