Israel is a nuclear weapon state outside of the Nuclear Non-proliferation Treaty. As of the end of 2014, its nuclear arsenal is estimated to include about 80 warheads.
Israel is believed to still be operating the now 50 year old Dimona plutonium production reactor, built for it by France. The reactor may be operated now primarily for tritium production. As of the end of 2014, Israel may have a stockpile of about 860 kg of plutonium.
Israel may own about 300 kg of HEU that was diverted from the NUMEC plant in the United States in the 1960s.