Why buy ROLLER JCUPS? I can sum up this question with one sentence from an icon in affirmation, "I'm Good Enough, I'm Smart Enough, and Doggone It, People Like Me!" -Stewart Focus on the "I'm good enough" and deserve premium messaging from Stew. You buy these because you can. Will you lift more from not having to adjust the barbell between sets...maybe. Maybe that little bit of extra energy allows you time to focus on breathing and focusing on what your about to accomplish. Maybe or maybe not.
Easily adjust the barbell from left to right using the built in rollers to line up centered with your chest or back prior to lifting. Sometimes when racking weights the position the barbell is in is not ideal and you have to adjust it back to normalcy prior to your next set. This is where roller j's come into play.