This tool is great if you don’t have a partner to work with or want to mix it up and work your own combos in private. This tool is 
mounted on your wall and allows you to throw any punches and kicks against it which helps you develop form and combination.
I would only recommend this tool for people living in houses (not apartments) as punching and kicking it may cause loud noises. This tool is about 3 feet high and 1 foot in width.
It’s great for personal workouts and maintaining shape and form. It also allows for throwing a large number of different combinations in punches, kicks, elbows and knees. Great for developing skill.
Here is a good video showing the possibilities of this tool when boxing (the one pictured on the right is better than the one in the video):