Small - Approximately 3 1/2 inches tall and 1 1/4 inches in diameter at its widest point. Medium - Approximately 4 inches tall and 1 3/4 inches in diameter at its widest point. Large - Approximately 4 3/4 inches tall and 2 inches in diameter at its widest point. The shafts of the Moon Plug are generally between 3/8 and 1/2 of an inch in diameter. | 
