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The Pivot Straight distributes pressure evenly over all the structures of the mouth, while this avoids pressure points, it does make the Mullen a fairly strong bit. The Pivot STR is a stronger mouthpiece that the Pivot due to the lack of curve in the mouthpiece, less curve means the mouthpiece touches less surface area, therefore increasing pressure.
The Pivot Straight applies pressure across the tongue and bars. The Pivot Straight has less curve than the standard Pivot which can make it a stronger bit due to the lack of curve the mouthpiece has. The center is closely linked with an internal pivot that does not interfere with the horses tongue or palate. Pressure descends onto the bars and due to the mouthpiece being a semi-broken mouthpiece, this Pivot link will hinder creating a squeeze on the bars – it also hinders the mouthpiece to fold backwards therefore creating little, to no squeeze on the bars. The Pivot allows for independent lateral aids. The Pivot is available in Sweet Iron. The Sweet Iron material was chosen as a metal option as it oxidizes. Oxidization encourages salivation and acceptance of the mouthpiece. The semi-broken, Pivot, has limited movement.