Jointed Mouthpieces, also called broken mouthpieces, have a single joint in the center of the bit. Pressure is applied up and out to the top and front of the mouth. When the mouthpiece is pulled, it creates a V shape, applying pressure to the horse's tongue, lips, and bars.
Three-Piece Snaffle Mouthpieces, also called double jointed bits, create more of a U shape instead of a V, making it a more gentle mouthpiece than the single jointed. This mouthpiece applies pressure to the lips, tongue, and bars of the mouth.
Double Twisted Wire Snaffle Mouthpieces are made up of two single jointed strands which are broken off-center of each other. Two strands amplify pressure on the bars of the horse. These bits are considered very severe.