The martingale style leash is one of the most common leads used to move dogs from one location to another. While it's not a training leash it is the perfect leash to hang by your door (I have 3 hanging by our door) to be ready to take your dog outside or to take a well trained dog for a walk.
It's also the perfect leash to fit in a jacket pocket or a pants pocket. Because of it's small size, this would be the perfect back-up leash for police officers to keep in a pocket.
The reason I chose to import this lead from Belgium was because of the quality of workmanship and the slip guide works the way these kind of guides should work. It doesn't just easily slide up and down the line, it takes some effort to move it and once in place it stays in place.