Just so the ordering is clarified after having a bit of a confusion on my end:

When ordering the small: You get  one  72" track section
When ordering the medium: You get two 72" track section
When ordering the large: You get three 72" track section


There was a bit of a mix-up when I did my order of two medium systems, but they fixed it right away after I figured out that one of the orders was not shipped. 


Now the product itself is amazing, I bought it to have two ten foot spans for my photostudio. It slides so well, even with placing two sections together to make for the length required. I use everything from light cloth to heavy drapery material, and the system rolls smoothly with the sliders that come with the item. I would recommend buying more of the sliders if you are using it for a photo studio like myself. I have four types of backgrounds on each ten foot section for quick, easy changing.