Modern instruments are pitched in B flat, but orchestral writing can have them pitched in most keys from low to high F.
Modern, professional instruments are "double horns" (with 4 rotary valves) pitched in F and B flat.
There are typically 3 trombones - 2 tenors and a bass.
The largest member of the family.
Brass Band Instruments:
Pitched in E flat.
Pitched in B flat; similar to the trumpet - many young musicians start on the cornet as it is shorter than the trumpet.
Pitched in B flat; often described as a fat trumpet, this instrument is essentially a valved bugle.
Perfected in 1844 (in Paris) by Adolphe Sax, these are pitched in E flat.
A larger version of the Tenor Horn, pitched in B flat.
The only instrument not to have valves, this instrument is pitched in B flat in a brass band.
A tenor tuba, this is pitched in B flat with a large bore and wide flare to the bell
There are 2 sizes of tuba - pitched in E flat and the contrabass B flat.