Myler HBT Shank Comfort Snaffle with Copper Roller MB 03Myler Stainless Steel 5" HBT Shank, MB 03T Twisted Comfort Snaffle with Copper Roller, Level 1 The MB 03T is a Myler twist version of the traditional French link or lozenge mouthpiece commonly used in snaffle bits with an added copper roller. The MB 03T rotates onto the tongue, applying tongue pressure, 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