Economy DS Bearing by YoYoRecreation.
If you thought that Vosun only made Yo-Yos of high performance at a low cost, you were very wrong... keep reading.
A stainless steel 8 BallBearing Narrow Size C .
A Chrome Steel 8 BallBearing size C "Flat".
A Ceramic Concave stainless steel 8 BallBearing. These are replacement bearings with Concave profile and available in ILYY (metric) Size.