The CFx™ Craniomaxillofacial Fixation System (formerly the M4 System) is a comprehensive system featuring modular instrument trays on top and three module bays underneath. The system comes standard with 1.2/1.6, 2.0, and 2.0/2.4 mm modules. 2.0 mm Orthognathic and the Orthognathic Supra Advancement modules are optional/additional to the typical set build.