W88
The W88 is an American thermonuclear warhead, with an estimated yield of 475 kilotons of TNT, and is small enough to fit on MIRVed missiles. The W88 was designed at the Los Alamos National Laboratory in the 1970s. Wikipedia
Detonation mechanism: Contact, airburst
Diameter: 18 inches (46 cm)
In service: 1989 to present
Manufacturer: Rocky Flats
Mass: 175-360 kg
No. built: ~400