The Eggbutt cheek piece prevents pinching of the lips and gives a solid feel against the side of the face. It also prevents the bit being pulled through the mouth. The release is slower than the loose ring and also introduces light poll pressure.
The port creates relief for the tongue while the barrel joint relieves pressure on the bars, while still allowing for individual lateral aids.
Bomber bits are made from blue sweet iron which oxidises easily to encourages salivation helps bit acceptance is warm and sweet.
Please note that due to the oxidisation the blue will fade with use.
Mouthpiece thickness -
B12 -12mm over bars