<https://ainsleysaddlery.com/en-eu/products/4-ring-barry-gag#product>
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"A 4 Ring Barry Gag is a specialised type of mouthpiece that incorporates two distinct gag mechanisms, providing a combination of unique pressure points and increased control. This design features a dual-action mouthpiece that reduces contact surface area while enhancing pressure in specific areas of the horse’s mouth. This provides heightened communication. \nThis heightened pressure can prompt quicker and more precise responses from the horse to the riders' cues. \nThe Barry gag mouthpiece is often employed in training or corrective contexts where precision and responsiveness are paramount. Its design aids in refining the horse’s reactions and improving overall communication between horse and rider. \nAlthough some horses may be ridden in this all the time, it can also be used 2-3 times just to help increase your horse's response before returning to a normal mouthpiece."
<https://ainsleysaddlery.com/en-eu/products/4-ring-barry-gag>