Aire Velo Bearings range of steel, stainless steel and ceramic (Si3N4) balls can be used anywhere on the bike but are usually used either in the headset or the wheels.
The steel and stainless steel balls are supplied as Grade 10 balls which refers to how precise the ball surface & dimensions are. Most bearings used within the industrial sector have balls specified as Grade 100 so Grade 10 is a very precise ball. The ceramic (Si3N4) balls are supplied as Grade 5 balls which is the highest level of precision you can get for loose balls so they will probably be the smoothest running part on your bike.
All sizes and materials of balls that we offer are supplied in packs of 10 due to their size & minimal cost.grade 5 grade 10