Chrome steel ABEC 5 Bearings 8x16x5 (10)
These are ABEC 5 precision bearings.

 
Measurements:? ? ? ? ? ? ?Inside Diameter x Outside Diameter x Width
 
Balls:? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Chrome Steel
 
Seals / Shields:? ? ? ? ? ? ?Metal Shield one side and Black Rubber shield the other.? Shield can be removed if desired.
 
Retainer Material:? ? ? ?Chrome Steel
 
Precision Rating:? ? ? ? ?ABEC 5
 
Lubrication:? ? ? ? ? ? ? ? ? Grease 58,000 RPM
 
Structure:? ? ? ? ? ? ? ? ? ? ? Deep Groove
 
Hardness of Balls:? ? ? ?HRC59-65
 
Hardness of Rings:? ? ?HRC59-65

Picture for illustration purposes only.