Silver plating is common on all brass mouthpieces because it is cost-effective and good in terms of tone quality. It is also moderately germicidal. Silver plating is not as comfortable or as expensive as gold, but has properties and qualities that some feel facilitate certain styles of playing.
The use of silver plating on brass mouthpieces is widespread because it is a cost-effective solution with good sound quality and has some germ-killing properties. While not as comfortable or costly as gold, silver plating offers features that some musicians prefer for specific musical genres.