The Hanging cheek is a fixed cheek bit which exerts a small amount of poll pressure due to the cheek pieces being attached above the snaffle ring. Poll pressure can help to lower the horses head and encourage flexion, making this bit is especially useful for horses with a high head carriage.
There are 2 products.
4106 Myler 06 Low Ported Mullen Barrel Snaffle on a Hanging Cheek
4133 Myler 33 Ported Barrel Snaffle on a Hanging Cheek