Pack of 10 original Israel IDF Nato 40MM filter. The Type 40mm filter canister was developed for the Israel Defense Force (IDF) to provide protection against all known NBC agents in the form of vapors and aerosols. It is supplied as an integral part of all Shalon’s personal respiratory protection systems. The 40MM NATO filter is made to offer protection from Nuclear, Biological, and Chemical agents to name a few, offering clean oxygen. I check each product myself and sell only the best quality products. Our products are carefully inspected. If you Are Satisfied With Service, I Appreciate A Good Feedback.