5" and 5 1/2" sizes: You are seeing a brand new design for this cheekpiece. Please be aware that some retailers may not have this style in stock yet so you may receive the original design.
Myler Stainless Steel Dee with Hooks, MB 33 Medium Wide Ported Barrel, Level 3
The MB 33 is the mildest Myler mouthpiece in terms of tongue pressure. The generously wide port allows room for the tongue to pass almost completely under the bit. Because this mouthpiece does not rotate on to the tongue and the port is wide, it applies little to no tongue pressure, working primarily off the lips and bars. The port on this mouthpiece is only 1 ½" high, so it will apply little to no palate pressure. Because the MB 33 offers such a high degree of tongue relief, the horse that goes well in this mouthpiece has a trustworthy and consistent disposition, and is trained to work off the leg and seat as well as the hands.
Independent Side Movement
Stainless Steel Mouthpiece
NOT Dressage Legal
Notes: For a slight increase in tongue pressure, see the MB 43LP or MB 43MP. For same tongue relief without Independent Side Movement, see the MB 16 (Western only). For the same tongue relief and Independent Side Movement, but with a slight degree of collapse, see the MB 05. For more generous tongue relief, see the MB 16PB.
The hooks make this a much more versatile version of the dee without hooks. Attaching the headstall to the top hook holds the bit in the correct position instead of allowing it to slide around the bridle cheek pieces. Attaching the reins to the rein hooks allow the rider to lift the cheek and use the Independent Side Movement™ of the mouthpiece. Using the hooks does not add leverage but allows the rider to transition from a direct rein action to indirect action without changing the bit. Adding a curb strap (using a Myler curb strap kit) incorporates curb pressure. Curb pressure is recommended for ported mouthpieces.
Size: 3 3/4" dee on 5" and 5 1/2" mouthpiece, 3" dee on 4 1/2" mouthpiece
Action: Direct rein action when reins are not attached through rein hook. Indirect rein action when rein is fixed on rein hook.
Discipline: Primarily English
Degree of Leverage: Little to no leverage when the hooks are used