This is a very large conch shell. It is approximately 32cm long. It has natural growth marks and some limestone. There are no cracks. The shell itself is lightweight, but it produces a large sound, especially the lower tones. The sound of the conch includes both lower and higher tones, and it has a distinctive sound befitting its size. I purchased it about a year ago to try it out and used it a few times. I disinfected the mouthpiece fitting every time I blew it, so there are no hygiene issues. I am selling it because I can no longer use it due to moving.