Flat C Port Precision Bit is an amzing bit with patented interanl spring that allows port to return to neutral after lifting the rein. Great for should control and keeping lower head set. This swival free system is one of a kind that can help you control shoulder left to right while capturing the horses head carriage at the same time. The second great feature is when pulling both reins it becomes a stiff bit. Very popular bit with youth and amateur riders.