What is everyone building link bars with

I have heim joints for the ends I am just wondering what wall tubing everyone is running

hey, on mine I over killed it, I used 1.5 inch round tubing with 3/8 inch wall and tap it out to fit the joint, and they are 38 inches long.. over kill I know but I am putt a lot of power to the rear, and they just look bad.. lol I will try to get you a pic