This is a Paul Petska chain ported bit. The shank on this bit is the newer shank that Petska has came out with. This bit has a port in the middle of the bit and a chain mouthpiece on both sides of the port. These bits are great for any discipline of riding that you do. From barrel racing to team roping to cutting to trail riding to riding young colts - you can trust that your Petska bit will be your best asset in your bit collection. The shank comes in a medium shank (darker pic) or a long shank (lighter pic) Conchos on the bits may vary.