Professional's Choice 7 Shank Collection Twisted Wire Bit has a little weight behind the mouth piece to allow quick release from riders hands. This is a great bit out of an O-ring or D-ring. With a shank of 6 1/2" and 5 1/8" two piece twisted wire mouth piece makes it slightly more aggressive than a smooth mouthpiece. This will demand more response and respect from your horse. 

Professional Choice

7 Shank Collection

Twisted Wire Bit

6 1/2 Shank