Myler HBT Shank Comfort Snaffle Narrow Barrel MB 01Myler Stainless Steel 5" HBT Shank, MB 01 Comfort Snaffle with Narrow Barrel, Level 1 The MB 01 is the Myler alternative to the traditional single jointed mouthpiece commonly used in snaffle bits. The MB 01 rotates onto the tongue to apply concentrated tongue pressure at the center barrel, but because the mouthpiece is curved, it wraps around the bars and lips instead of pinching. The barrel in the center applies approximately the same pressure on the