A trumpet is a brass wind instrument noted for its powerful tone sounded by lip vibration against its cup-shaped mouthpiece. A trumpet consists of a cylindrical tube, shaped in a primary oblong loop that flares into a bell. Modern trumpets also have three piston valves as well as small, secondary tubing that act as tuning slides to adjust the tone. Almost all trumpets played today are B-flat. This is the tone naturally played when the trumpet is blown. They have a range between the F-sharp below middle C to two and a half octaves above (ending at B), and are comparatively easier to play than other brass instruments.