This Kit is used for testing which pad the horse wants/needs.  
 
Kit includes one pad of the following:
 
Gray 1"
Blue 1/2 and 3/4"
White 
Natural 
RWB
Trail
 
It is a Large side pad.
 
Take a pad and place under the horses hoof and allow the horse to stand on it.  Watch for licking, chewing, yawning if the horse likes the pad.  If the horse stepping off the pad the horse doesn't want that pad.  The  video on the home page of the website shows how to test each hoof and what to look for in response to which pad the horse like/wants.
 
This helps narrow down which pad should be used for that hoof it was tested on.  Test each hoof that pads are needed for to know if the same density is needed on the other hoof.