Zeekio 100% Ceramic Yo-Yo Bearing - Standard Size C
This is an all ceramic bearing. The balls are ceramic and the casing is cermic. Ceramic has a lower friction than solid steel and longer spin time. This bearing is the top of the line.
Once you try it, you'll see what we mean.
Size is Standard C - .250 x .500 x .187 Fits most modern yo-yos.