I have various other items for sale as well. This is an extra-large, thick-shelled conch shell used in Shugendo practices. It is approximately 40.5 cm long and weighs 1541g (^.^)♪♪♪❣️ The hole for blowing is about 6mm. It has natural growth marks. There are no cracks. Please check the photos. It's a beautiful, well-proportioned, and balanced❣️ extra-large, thick-shelled conch shell used in Shugendo practices (^.^)♪♪ I have confirmed that the conch shell can produce five musical notes (Oto = 2 notes of wood and fire), (Koto = 3 notes of earth, metal, and water). If you need a beginner's text on how to blow the conch shell, please write in the comment section. I will include it for free. The resonance of the Oto notes is especially superb ^ ^♪♪〜♪❣️ Free shipping nationwide❣️ The price may fluctuate depending on the cost of the shell.