In recent years we have been testing and experimenting with shell wind instruments,  inspired by the archaeological record.  Our first replica of the 18,000 year old Marsoulas Cave artifact from France was a success, so we started looking into Mesoamerica and the Pacific cultures as well. This fun modern model was inspired by some of the archaeology and ethnographic writings/drawings of Mesoamerican cultures using Welk and Queen conch shells for instruments/trumpets during ceremonial events and processions.  Our research lead to the cutting of the mouthpiece and drilling of small hole into first chamber from the apex, and results in a horn sound(hear video above). This example measures around 10 inches long, and has a drilled hole for the mouth piece. Within a minute of practice, most have been able to figure out how to purse the lips to get the correct sound, and the video and sound above are the exact shell in this listing here.  This particular shell has the best sound that we have ever had come out of a shell trumpet here, and has only been used for this test video.