The FCI AirMax VS® Hard Metric Connectors use a shield-less design with an air di-electric between conductors and are designed to provide options for the protected receptacle to be on the backplane/midplane or on the daughter card. Options for the FCI AirMax VS® Hard Metric Connectors include a range of differential pairs/column, column pitches, or column counts, optimized for either 100Ω or 85Ω impedance to match channel impedance and reduce loss, halogen-free signal modules, and the availability of power and guide modules to complement the signal connector offering.