This is an adjustable gag which uses a rubber horse-bit for the mouthpiece instead of a ball. It features black leather straps, a silver buckle and a black rubber bit that is 5 inches long and one inch thick. The strap measures 25.5" fully stretched out.
My wife and I went to a kinky club and she took me to the middle of the floor and told me to strip and get on all fours, every one was watching me as I took all my clothes off and got on my hands and knees, she put this and some straps on me and then a horse tail butt plug and everyone watched her ride me around the club all night.
I found that the Locking Rubber Bit Gag, that came as an add-on to the Pony Head Bridle Set, is effective, but clearly the full-head rubber bit trainer is more enforcing.