We build our roll cages to SFI specs from 4130 chrome-moly tubing. All bending is done on a mandrel bender. Most notching is done on a CNC laser machine. All tubing joints  are TIG welded. All cages are custom built to the customers specifications as far as shoulder width, base width, and over all height. A complete cage for a cast OEM tractor is ready to bolt on. It comes with an aluminum seat and a 5 point restraint.
The top four pictures are a complete cage for a IH 1066.
This picture is a cage kit to weld on to your own base. The tubing joints are fully TIG welded. This particular cage was installed on a component light super stock New Holland tractor we built for Steve Bach called Simply Nastyer. 
This picture shows some of the different shapes that customers have ordered.
Roll Cages