Khaos that's the name alright. Some have a stiff leather guard and others don't have a handguard on the oak blade. I can tell you they hurt if you make an error in practice with another person.
I've had mine for a very long time. I went to the Kodakan, the home of Judo, when I was 16. I was a member then. I did do some visiting at various Dojos and picked up a real Bokken.
Bokken - Wikipedia, the free encyclopedia