For the ultimate in protection our Funny Car Style Roll Cage Kit is your best choice. This roll cage kit is an add-on for the 12-point cages. Main components are mandrel bent from 1.625'' dia. x 0.134'' wall steel tube with additional bracing made from 1.25'' dia. x 0.134'' wall steel tube The head rest tubes are formed from 0.75'' dia. x 0.065'' dia. wall steel.