These are conch shells processed to resemble a conch horn. Set of 7. They can be blown, but the sound produced is only moderate. Perfect as a mountain climbing amulet or a bear deterrent whistle! 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. Regarding transactions, no claims and no returns are accepted. SPEC Mouthpiece: Brass, Aluminum Blowhole: 13mm Length: Approximately 5-8.5cm Width: Approximately 2.5-5.5cm Weight: Approximately 21-36g