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Top wing tree. Aero (squished tube). 4130 Chrome Moly. Powder coated black. Aluminum adjusters. 3/4" adjustment holes, with a total of 3" of adjustment. "X" design for lateral and horizontal strength. The squished tube aero tree is designed to give you the least amount of drag possible from your aero package. The sleek, narrow design keeps the smallest possible aero profile, allowing the air to flow around the upright rather than hitting a wider surface and slowing your car down by increasing drag.