Israel has several hundred nuclear weapons. They may even have more considering they are a highly technological society.

Israel even buys military hardware and often makes their own modifications improving on the original design for their own needs.

They don't openly admit to being a nuclear power. That is understandable considering their history and their neighbors.

They have a wide array of nuclear weapons from large megaton warheads to small tactical warheads to submarine launched warheads of various configurations.

It is believed the bulk of their nuclear arsenal consists of small tactical warheads that can be used for strategic strikes or detonated over an advancing army with little long term consequences to the overall inhabitability of the region.