Whistle Key Chain Nautical Solid Brass Vintage Collectible Keychain Marine Gift The bell will also be used during periods of low visibility. In these circumstances, the bell will sound rapidly for five seconds. Eight bells will also sound at the death of a sailor.The US Merchant Ship Bell Keychain is made of 100% real brass that comes on a brass chain with a screw lock carabiner. This little piece comes with a movable brass clapper so you can actually ring the bell. Now you can take home a replica of Maritimes fascinating history with the US Merchant Ship Bell Keychain.