These are conch shells processed to resemble conch horns. Set of 4. They can be blown and make a sound, but it will be a small sound. They do not produce the same sound as a conch horn from the Warring States period. How about using them as a charm for mountain climbing! Regarding the production, they have been thoroughly cleaned, disinfected, and processed, but they are natural items. Please refrain from purchasing if you are sensitive or seek perfection. They are also listed on other sites, so please understand that they will be removed once sold out. Regarding transactions, no claims and no returns are accepted. SPEC Aluminum mouthpiece, lacquer-painted finish Length: Approximately 8-9cm Width: Approximately 3.5cm Weight: Approximately 13-20g