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curb bit 
Bit composed of a mouth and two side bars; it lowers the horse’s nose and is used in conjunction with a snaffle bit.
mouth
Metal bar that is placed in the horse’s mouth; it is controlled by the reins to steer the animal.
rein ring
Round part that is attached to the end of the lower cheek; the curb rein is attached to it.
curb chain
Metal chain that hangs from the cheek rings and passes under the horse’s jaw to secure the bit.
lower cheek
Lower part of the bar that holds the mouth; it is usually longer than the upper cheek.
lip strap ring
Round part for attaching a false curb chain (strap preventing the horse from seizing the arms of the bit’s mouth with its mouth).
curb hook
Part that connects the curb chain to the cheek ring.
cheek ring
Round part forming the end of the upper cheek; the curb chain and the cheek strap are attached to it.
upper cheek
Upper part of the bar that holds the mouth.
port
Curvature of the mouth that is designed to reduce the pressure exerted by the bit on the horse’s tongue.
