Mugen Seiki 15x21x4mm Bearing (2)
[MUGE0601]

Mugen Seiki 15x21x4mm Bearing (2)
Spencer Wass - Rating: 3 of 5 Stars! Tuesday, March 29, 2011
I did a little research and these are not a Japanese made bearing unfortunately. To extend life, do not spray with air or liquid in attempt to clean as this only pushes dirt into the bearing.