Vincent Bach was a rare combination of artist and engineer. He constantly changed his mouthpieces in search of the perfect design. It wasn t until the mid 196 s that he stopped and finally settled on more standardized design. This created the standard for mouthpiece making that is still used today. These standards are now known as the Classic Series. Bach Classic Mouthpieces are the most played mouthpieces in the world by students amateurs and professionals! Bach Standard Silver Plated Flugelhorn Mouthpiece 1 1/2B. Cup Size 1 1/2B Cup Depth Medium Deep Diameter 17.00 Rim Shape Medium Wide Rim.