Grizzly blades mostly. 18 tooth rakers I believe. I wanted something with less TPI, but they weren't offering them. I can't tell you about the other two, but I'm fairly certain the last one was high speed steel. I did buy one Olson bimetal blade as well, because I thought I remembered someone recommending them.
The guide bearings are the only parts I’ve had to replace on my 4x6 in 40yrs of service. The worn out ones were free but rough under pressure causing the jump and bump. Replaced them at least 35yrs ago and never had a problem since.