The eggbutt snaffle has fixed cheek pieces. Aids have a more direct effect and the bit allows less freedom of movement compared to the loose ring snaffle, making it better suited for horses that tend to play with the bit too much.
The double jointed bit consists of three parts. The middle section of the mouthpiece lies flat on the tongue, this causes more pressure on the tongue than a single jointed bit. The thicker the middle section, the more pressure it will create on the tongue.