The front rotors are 13.5kg vs. 17.5kg for the stock Trackhawk 2 piece rotors. 
This reduction in rotational and unsprung weight allows for quicker acceleration and suspension response.
 
Replacment two piece front rotors for Jeep Trackhawk.
 
Drilled and slotted specifically for left and right side aplications.
Sold as a piar of rotors, 1 x left & 1 x right.