Bach Heavy Bottom Valve Caps Silver Precision-machined construction and a warmer sound Precision machined from nickel silver, with twice the mass and twice the weight of standard bottom valve caps, Bach heavy valve caps dampen vibrations The result is a warmer, more powerful sound from your trumpet that is perfect for the concert hall, studio, and club alike Set of 3 Precision machined from nickel silver, with twice the mass and twice the weight of standard bottom valve caps, Bach heavy valve caps dampen vibrations