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The Horn is made by a 3.7 length tube coiled several times. The Horn is made of brass, gold brass or nickel silver. The most commonly used are the double Horns, which are in F and in B-flat, it means that the air flow by different tubes depending on the transposition the player use. It has three valves, operated by the left hand. The right hand is placed in the bell, and the player can adjust the intonation with it. The Horn can be played by using a mute, which change its sound, making it smoother.
The hornist make sound the instrument by blowing into a mouthpiece. It is usually pitched in the key of F (although its pitch vary habitually during the performance) and notated in treble clef. It means that when the hornist play a C it sounds a F. It is written from F2 to C6, but it sounds from B1 to F5. Its low register sounds mellow and sonorous when is played piano, whilst when it is played forte it sounds less powerful and expressive than in the upper registers. The middle register is full and resounding, while the upper register is soft as velvet, bright and very intense and brilliant.