It is a 4.5" Arch Butterfly. Yes, it has a tall "purchase" (the part above the mouthpiece), and it does slide up and down a little bit (I don't care for that part, but...) It is an English made bit that was given to me to try on Alax because he is such a "fussy" mouthed horse. So far, it is what he goes best in and I have tried A LOT of different bits on him. He CAN'T STAND a snaffle (direct rein) pull, and likes the curb action better. I think it is because he has fat lips and tongue and the snaffle pinches more. He would rather the bit rotate than pinch. I did have one judge that looked at his bit and said that it was too big, but then in the next breath said that he seemed to go well on it. The other thing he can't stand is the bit touching the sides of his face. That is why the 4.5 has worked better than the 4" low port Liverpool I used to drive him in. In a lot of ways, that bit "breaks the rules" for bitting a mini (mouthpiece too wide, should only use a snaffle on a mini, etc.) but it is what he is happy in so I'm not going to fight it.
Myrna