Made out of 1-5/8x.134" wall mild steel tubing. Uses the same rear suspension as our Eliminator II chassis kits. All round tube construction makes it the perfect choice for the "fast street car" classes. The 4-link brackets mount 3-1/2" off the ground behind main hoop on the 4-link support tubes. For cars with the main hoop more than 23" forward of the rear axle center line. Kit includes a pair of frame rails; two 4-link support tubes; upper shock mount crossmember; upper shock mount tabs; rear crossmember; 1-1/4" frame gusset tubes; hardware; instructions and drawing. Shipped unassembled by UPS. Note: main hoop and cage rear struts are not included; they are part of the roll cage kit.