Mute

 
     Unless it specifically indicates another type, this word always refers to a standard, non-transposing, straight mute. There are a number of varieties of these available, in a very wide range of prices if you're looking to buy a new one. They are all basically a cone, open at the small end, with small strips of cork attached so that they can be inserted safely into the bell of the horn. Most of them are made out of wood or cardboard, but there are a few manufacturers that make metal straight mutes (like Dennis Wick). This can be confusing sometimes, as the term "metal mute" used to be used as slang by some horn players to refer to transposing, or stopping mutes. These are much smaller, seal the bell of horn off completely with cork, and are really just a poor substitute for hand stopping. I hope the simple drawings below will help clarify this description for those who are still confused by my description. It should also help to explain why I have never attempted to make a living in the visual arts.
 

Straight Mute

(Non-transposing)

Stopping Mute

(Transposing)