It is cylindrical in shape, five feet long, with a circumference of 52.5". It has four horns in one end. This end bears no. 122 mine and bears no. 943 on opposite end. Length of base of horns is 3.5". Circumference of base of horns is 4.5". It has a brass detonator fitting 5" in diameter located in its side, 15" up from the bottom of the mine.
Naval History and Heritage Command