Special Agent is Medium to Heavy oil. I would assume the triple x could be used on a variety being pearl reactive & a high end ball from the Master line. Depending on the layout & polish you could probably use it on light oil also if you had too. I have a Shift & Special Agent & only will use the Special on Medium to heavier oil otherwise it loses energy before it gets to the back end. My Shift does not ever lose energy, I think because of the weight block in it. But that's just my opinion.
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Just grip it & rip it!