The Rev Rim is a yo-yo first released by Yomega in 1999, designed specifically for looping play. It featured a roller bearing system for long sleep times and high-density rubber rims. It is considered by some who played with it to be a bad yo-yo, with its shape being awkward.
After couple or so years on the market, it was eventually discontinued.
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Yomega Rev Rim in packaging. (from Dave Schulte's collection)