Since 1987, 25 additional countries have become MTCR Partners (members).  For a complete roster of current members, see the attached list.

The MTCR is not a treaty.  The "Regime" consists of a common export policy (MTCR Guidelines) applied to a common list (MTCR Annex) of controlled items, including virtually all equipment and technology needed for missile development, production, and operation.  These multilateral export controls are implemented by each Partner in accordance with its national legislation.
 

The MTCR Guidelines restrict transfers of missiles -- and technology related to missiles -- capable of delivering a payload of at least 500 kg to a distance of at least 300 km.
 

The original (1987) Guidelines restricted transfers of nuclear-capable missiles and related technology.  However, in January 1993, the MTCR Partners extended the Guidelines to cover delivery systems capable of carrying all types of weapons of mass destruction (chemical and biological weapons, as well as nuclear).
 

Category I Annex items -- complete missile systems, as well as major subsystems (e.g., rocket stages, engines, guidance sets, and re-entry vehicles) -- carry a strong presumption of denial and are rarely licensed for export.  In effect, they are not exported at all to countries of proliferation concern.  Transfers of production facilities for Category I items are prohibited absolutely.

Category II Annex items -- other missile related components -- can be licensed as long as they are not destined for an end-use that could contribute to the development of a missile of MTCR range/payload capability.