Main hoops available in 1 3/4 inch and 1 5/8 inch DOM or Chromoly. Mandrel bent to ensure roundness and strength throughout all the bends. When you draw bend a pipe it flattens or eggs in the bend, which makes the bends the weak point in the roll bar, if it has already been bent halfway it natural effect would be to finish bending where it has already been started. All of our roll bar kits are bent by the measurements to the inside of your car to ensure perfect fitment. Other manufacturers of roll bars will tell you thier kits are mandrel bend, when infact they are not. The easiest way to tell is to feel the middle of the bend, if it is egg shaped it is deffinately not mandrel bent. We use tubing software to ensure a perfect fit.