A 2 Ring cheek piece introduces poll pressure as well creating leverage on the mouthpiece, the 2 ½ ring version is the softest version of ring bit as the ½ ring softens the leverage on the mouthpiece and poll. The Eggbutt cheekpiece prevents pinching of the lips and gives a slightly more solid feel against the side of the face. It also prevents the bit being pulled through the mouth.The release is slower and also introduces some poll pressure.