Trumpet with working pistons from BrickLink Studio
Gear4music on Twitter: "@Pello09 Unlike the LEGO trombone, our plastic brass instruments ain't no toys - they're the real deal!😃 https://t.co/fnZqTHzdIK" / Twitter
LEGO IDEAS - Trumpet
Nothing But Brick: Trombones And The Marvels Of 3D Printing Technology