The Department of Health and Human Services, specifically the National Institutes of Health (NIH), intends to enter into a sole-source contract with Fieldline Industries, Inc. for the procurement of advanced optically-pumped magnetometers (OPMs) to develop a non-invasive magnetocardiography (MCoG) sensor array. This contract, identified by solicitation number NIMH25001453_1, aims to enhance the capability to monitor human brain function with high temporal and spatial resolution, addressing current limitations in neuroscience through the delivery of 64 Fieldline V3 sensors and associated electronics, along with research and design services for a compound gradiometer. The procurement is justified as a small business set-aside, as Fieldline is the sole supplier capable of providing these specialized sensors, having successfully collaborated with NIH for over five years. Interested parties should submit their responses electronically to Joseph Kennedy at joseph.kennedy@nih.gov by the specified deadline, with the contract period commencing on April 1, 2025.