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 50cm long and weighs a whopping 2127g. The mouthpiece hole is about 6mm. It has natural growth marks. The crack in photo 4 is a growth mark, not a crack! There are no cracks. Please check the photos ^ ^♪♪ The sound is booming because of the thick body (^.^)♪♪ Please, by all means, experience it. This item offers the enjoyable resonance of the "Otsu" sound. Secretly gaining popularity ^ ^♪♪♪ I have confirmed that the conch shell sounds can be differentiated into five tones (Otsu sound = wood and fire, two tones), (Kou sound = earth, metal, and water, three 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 set based on the cost of the shell.