Myler Stainless Steel Loose Ring, MB 04 Low Port Comfort Snaffle, Level 2 The MB 04 is similar to the MB 02 in that it will rotate on the tongue and apply tongue pressure, however, it has a small (¼") port that introduces some tongue relief to the horse. The port allows the horse to swallow and move his tongue when he is moving forward and relaxed, which acts as a release or reward. The mouthpiece is curved, and it wraps around the bars and lips instead of pinching. Independent Side Movement Stainless Steel Mouthpiece Curved mouthpiece does not pinch lips and bars Copper Inlay USEF 2012 and FEI 2016 Dressage Legal. Consult rulebook for more information. Notes: The MB 04 provides an excellent transition from Level One to Level Two. It is suitable for a wide range of horses including green horses, experienced horses entering the Myler System, horses that have been ridden exclusively in a single-jointed mouthpiece, or horses that have not been ridden for a while needing re-schooling. The loose ring is a simple stainless steel "O" shape where both the bridle and mouthpiece have no fixed point of attachment but slide freely around the ring. The loose ring allows a lot of play as the mouthpiece slides freely around the ring. Size: 3" ring Action: Direct Discipline: English or Western Notes: The loose ring is generally considered one of the most non-interfering cheek pieces because the mouthpiece slides freely around the ring. However the play in the mouthpiece can make it difficult for a horse to find your hands as the mouthpiece is in continual motion. The movement of the mouthpiece can also exaggerate or create a busy mouth in young or anxious horses. It is best suited for more advanced horses fully schooled in leg and seat aids as well as rein aids.