Like the rest of the bagpipe, they are often decorated with a variety of substances, including metal (silver/nickel/gold/brass), bone, ivory, or plastic mountings.
Chanters come in two main types, parallel and non-parallel bored (although there is no clear dividing line between the two).
On the Great Highland Bagpipe, the internal bore is conical: it is this that gives the chanter its exceptional volume.
[1] On the Great Highland bagpipe, tuning of the individual notes of the chanter is done using tape to slightly cover the finger holes as needed.
[2] It is somewhat similar in appearance, though slightly smaller than the bagpipe chanter, and has a top piece before the reed so it can be blown directly from the mouth.