I have various other items for sale as well. This is an extra-large, thick-shelled Ara-fura-o-nishi conch shell. It's approximately 54.5 cm long and weighs a whopping 2140g. The mouthpiece hole is about 6mm. There are natural growth marks and limestone deposits. The crack in photo 5 is a growth mark, not a crack! There are no cracks. Please check the photos ^ ^♪♪ The sound is a booming sound because of the thick body (^.^)♪♪ Please, by all means, experience it! This is an item that offers the fun of the sound of "Otsu-ne" (a specific tone). Secretly gaining popularity ^ ^♪♪♪ I have confirmed that the conch shell sounds can be differentiated into 5 tones (Otsu-ne = wood and fire tones), (Kou-ne = earth, metal, and water tones). If you need a beginner's conch shell blowing guide, please write in the comment section. I will include it for free. The price is determined by the cost of the shell.