WR-MM Headers - Polarized 2.54mm staggered pitch (1.27mm pseudo pitch) PCB through hole mounting board-to-board MiniModule header connectors for use with ribbon cable with a 1.27mm pitch. These WR-MM series 2.54mm MiniModule header connectors have a low profile, compact design with a red UL94-V0 PBT body and built in polarization. The contacts of these WR-MM series MiniModule through hole mount header connectors are made from phosphor bronze with a matte tin over nickel plating.