You can’t improve your grappling skills and stay sharp if you don’t practice on a regular basis. You may not always have access to a training partner, but the Fairtex Maddox Grappling Dummy is useful for practicing chokes. You can also try side mount, full mount, and other grappling situations.
This grappling dummy has a neck that supports various chokes. It can be stretched out into half guard for more drills. Maddox is made of synthetic leather. More information is available here.