A Porterhouse has the largest portion of the tenderloin in it - You get two steaks in one: a Filet Mignon & a New York Strip.
 
Base price shown is rated for 1 pound of meat. Price adjusts by weigh of specific cut.
 
The weight range for sizes are:
 
Small: 1-1.25lbs
Medium: 1.3-1.5lbs
Large: 1.6-1.75lbs
XLarge: 1.8-2lbs