White Oak & Purple Heart
Well, I have 2 bokken, both from White Oak. One is slim, and I use it for kata while the other is quite thick and large which I use for suburi. My jo is made from Purple Heart and it is fantastic. Admitedly, the only real reason to have anything made from Purple Heart is for aesthetics, but who cares. The Purple Heart gives the jo a unique look and feel. Good stuff.