Loose rings independent of cheeks, as designed by Franz Maringer, hence the name 'FM' Bit.
The FM is also know as a Fulmer Bit and is the bit of choice for those following the teachings of Phillippe Karl.
It is an excellent bit for mouthing and starting young horses.
This bit has the 'play' of a loose ring bit, with the additional support of the full cheeks.
This is an excellent bit when used with FM Keepers (sold separately).
FM Keepers are not required to be used under competition rules, however they can help the stability of the mouthpiece and they are recommended for young children on ponies.