This product ends up being a 2nd bat knob making the bat feel about an inch shorter. My son was choking up an inch on his bat all the time and this allows him to do that and still have power to pull the bat correctly through the zone. It is made of very hard rubber which is good but it's difficult to get on the bat initially and don't expect to take this knob on and off the bat. When it's on, it's on, and I think I may have to cut it off when my son doesn't want it on anymore. I liked it so much, I bought a 2nd choke for my son's BP bat.
This product effectively makes a bat one inch shorter for anyone who has a bat that is slightly larger than required (perhaps for a boy still growing into a bat or whatever reason you might have). By making the bat one inch shorter it also makes the bat "feel" slightly lighter. It's just a way to force someone to choke up on a bat by one inch - and it works!
the knob helps my bat control alot my bat was a little to heavy and i was struggling with my hitting badly. the night i got the knob i went 2 for 3 with 2 doubles i realy feel like it makes a difference in my swing