Leading shock tower the Semi-Split Bulkheads accommodates the strengthened M4 surprise screws that offer increased reliability. The best surprise tower is CNC-machined from 4mm Swiss 7075 T6 aluminum for durability and strength. Front tower features one more type of surprise absorber roles for super fine customizations. The lower line creates less framework roll for higher component rate whilst the top row escalates the roll to simply help increase traction.