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The full kit comes with the gas mask, a drinking tube, a filter (either brown, grey, tan or black), a syringe used for treatment in the case of exposure to nerve gas and an instruction manual. It was intended to be used whilst evacuating a contaminated area. It is still issued today due to the high threat of nuclear/biological/chemical attacks. The Israeli 4A1 was issued to over 4 million Israeli civilians during the Gulf War. The newest variant of the filter is a black filter made in 2014, the black filter is known to have an expiry date about 8 years after the production date. Another is grey and was made in 2003, a tan filter was also made in 2004. The mask was issued with a 40mm filter, there are four known makes of the filters, one is brown and was made around the '90s. Both were developed during the Gulf War, they were developed because of the high threat of Nuclear/Biological/Chemical attacks in the Middle East. The mask is made out of black rubber with easily adjustable straps that come in both rubber and the more scarce stretchable fabric. The 4A1 is the civilian equivalent of the Israeli M15. The 4A1 built on the Model 4 (Model 4 was a copy of the German Dräger Simplex) by replacing the main exhale valve with a grid along with adding a voice diaphragm on citron models, and adding a drinking tube. The Israeli 4A1 is a civilian mask, made shortly after the Model 4.