The new Center Trac Bearing from YoYoFactory is now available; this is the SMALL size one.
The Center Trac has a concave outer surface so that the string is focused towards the centre of the bearing. This result's in a much smoother and longer spinning yo-yo because the string does not rub against the side walls of the yo-yo slowing it down.
With this bearing you will be able to compile yo-yo tricks which are very complicated and long.
This bearing fits any yo-yo that uses the bearing size or type A, or Small Size, measures 5 x 10 x 4 mm.