Amazon.com: ADVIK Pro Piccolo Trumpet 4 Valves Brass Nickel S1 Master's Choice with Hard Case & MP : Musical Instruments
Titan 4 Valve Edition D/Eb Trumpet - Stomvi USA
NPR Music - Ibrahim Maalouf plays a four-valve trumpet — most just have three. The extra valve, attached to the button a trumpeter pushes down, allows the Lebanese musician to play quarter-tones--the