They may well be. I have not seen Mancini selling anything like a Pro magnum UNDER their Brand. Just the bearing less HS ones. I will have to look on their website. Either way those would work as well to the original poster. I have used the PRW stainless rockers with out issues. PRW also makes an aluminum roller bearing rocker that looks like a blue Harland Sharp. I have not used those so I cannot tell you much about them.
Todd