Each missile was able to deliver three ET.317 thermonuclear warheads. The Polaris missiles were equipped with British warheads. Bulava missiles, with a reported range of and six MIRV warheads. The warheads and missiles would be mated in the UK. Fajr-5 missiles, which extend to , also hold 45-kg (99-lb) warheads. Pakistan supposedly possesses about 80 nuclear warheads. Poseidon offered a massive MIRV capability of up to 14 warheads per missile. Total number of deliverable nuclear warheads stored there is over 3,000. Estimates of Pakistan's stockpile of nuclear warheads vary. Supergrade plutonium is used in W80 warheads. It is thought Israel possesses between one hundred and four hundred nuclear warheads. Israel is estimated to possess somewhere between 75 and 400 nuclear warheads. At one point Okinawa hosted approximately 1,200 nuclear warheads. The 14 SSBNs together carry about half of U.S. active strategic thermonuclear warheads. The W54 was one of the smallest nuclear warheads deployed by the United States.