The Micro ITR has far more versatility then the other models, it is still a relatively small reel and very easy to conceal if you are wearing a shirt that buttons down the front. It is always best to pin the reel in your clothing so that the thread can feed out the center of the space between the two buttons on your shirt. (Not through a button hole, this creates too much drag on the thread!) The Micro ITR is about 4.5 inches long by 3/8” in diameter it offers up to 20’ of retraction distance before the line will snap. It comes with approximately 80’ of Kevlar Invisible Thread. The Micro ITR also has a bit more tension on the line and proves to work better for the Floating Rose Routine.