As an artistic life style chaser, I prefer to spend lots of time on making things with heart.
The swivel knife is carved with "Propitious Clouds", Propitious Clouds is a very good symble means happiness, peaceful, rich and so on. It was used on 2008 Olympic Games.
The diameter is about 13mm.
There is 1 bearing in, and the blade is normal high-carbon steel, if you need a better one, please go here:
M390 Steel blade: http://www.leathercraftpattern.com/M390-steel-swivel-knife-blade