The Eggbutt shape will prevent pinching of the lips. The release is slower and some slight poll pressure is introduced. The Eggbutt Gag is the gag version of the Eggbutt is stronger and will create more leverage on the mouthpiece whilst at the same time introducing more poll pressure.
Our Snaffle is a popular bit due to the curved mouthpiece which distributes pressure more evenly over tongue and bars. With the offset centre link it will reduce the nutcraker action and pressure points on the tongue.
Disclaimer: Sweet Iron will oxidize when it comes into contact with mositure, this oxidation process encourages salivation which improves acceptance of the bit. This process changes the blue colour of the Bomber bit to a brownish grey. If not used for a while, any build-up may be removed with a scourer and wiped with a damp cloth.