These springs are in the same dimensions as the RX28 Double A Arm Front Springs.  They are stiffer than the Gold springs and are good for Lower Roll Center Set Ups (when removing shims under the knuckle).  These springs are also meant to be used in the rear of your Giulia Conversion kit from Reflex Racing.
 
The order of stiffness from less to most is :      GOLD>>>ORANGE>>>BLUE>>>RED