The W44 had basic dimensions of 13.75 inches diameter and 25.3 inches length, a weight of 170 pounds, and a yield of 10 kilotons. The W44 was in service from 1961 to 1989. A total of 575 weapons were produced. The W44 was probably the same basic design as the Tsetse primary, or fission bomb core used on the B43 nuclear bomb, W44, W50 nuclear warhead, B57 nuclear bomb, and W59 nuclear warhead.