Long arms?

Now I don't want to start the debate on wether they are good or bad, I just want to know what kind of material people are using for the arms. (dia./thickness/carbon/alloy ect.) I'm getting ready to plan out my long arms and need some info for my materials list.

TIA
Neil

Neil. I used 2" tubing with 1/4" wall. Or was it 2.25" tubing? Either way it will be strong enough for ya.

Mine are 2" Chromoly.