The 33WL offers the highest degree of tongue relief in a dressage legal mouthpiece.

The 33WL port has been widened considerably to permit plenty of room for the tongue. 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 bars and lips, incorporating some chin and poll pressure depending on the cheekpiece.
This mouthpiece has Independent Side Movement.
Stainless Steel Loose Ring with Stainless Steel Low Wide Ported Barrel (MB 33WL, Level 3) Copper Inlay.
USEF dressage legal (1/2012), FEI dressage legal (7/2016). Consult organization's rule book for more information.

89-28345 Myler Loose Ring with Low Wide Ported Barrel MB 33 WL