Made out of 2x3 x.120" wall mild steel tubing. The low profile design is for full size pickups, this keeps the frame under the stock bed. The heavy duty .120 wall tubing used has enough rigidity to be used without a roll cage. We do not recommend you use this frame if you plan on hauling or towing a trailer. The frame attaches to the OEM frame with the 120 degree bends and the 6 1/2" dropped crossmember. Minimum outside width for this frame is 26". It is designed for our part no. 6270 urethane bushed 4-link. Kit includes rear frame rails; 6-1/2" dropped crossmember; shock crossmember; upper shock mounting tabs and hardware; rear frame 2x3" crossmember; instructions and drawing. Shipped unassembled by UPS.