YoYoFactory - Smooth Unresponsive Play
The concept with center-trac: Take a normal bearing and create a flat groove towards the inside of the bearing allowing the string to remain trapped in the center away from hitting the side of the yo-yo during intense string trick play.
What this will do for you:
-Make your yo-yo as nearly unresponsive as possible when combined with a wide gap.
-Make string play smoother as it keeps the string away from catching the side of the yo-yo.
This is an excellent upgrade built to fit in any yo-yo using the very popular Size C bearing (YoYoJam, YoYoFactory, etc.) or Size A bearing (YoYoFactory,Duncan).
Not sure if it will fit your yo-yo? Feel free to contact YoYoExpert for help!