This model--the RB II Roller Bearing Yo-Yo--was the same one used at one time by Jennifer Baybrook, 1998 World Yo-Yo Champion in looping. It is a roller bearing yo-yo like the Yomega Raider, but is supposed to deliver maximum spin times because of the size E ball bearing. This roller bearing yo-yo, with a precision "scooped out" design, is lighter in weight compared to the Raider. At the time, it was recommended for advanced players and intermediate players with advanced skills.
This is from the second release, even lighter than the first. Notice the protruding axle sides on the outside of the body ... beyond the rim of the yo-yo.