Toklat Myler Level 1 Hbt Shank Sweet Iron Snaffle Bit. Stainless Steel 5" HBT Shank with Sweet Iron Snaffle 3/8" (MB 09 3/, Level 1) Copper Inlay Mouth 5" This mouthpiece is made of polished Sweet Iron which naturally oxidizes or rusts. Harmless to horse, it has a sweet taste and promotes salivation. ... - Toklat Myler Level 1 Hbt Shank Sweet Iron Snaffle Bit.