Magnetic Microcalorimeter ("MMC") 32-pixel gamma-ray detector. The central chip with gold features has the gamma absorbers. The actual MMC sensors are underneath the gold features you can see. The 4 chips around the perimeter of the absorbers provide 16 channels of first-stage readout SQUIDs. This superconducting microdevice was designed by our group, and fabricated in collaboration with Robin Cantor and the team at STAR Cryoelectronics of Santa Fe, NM. This assembly is about 1 inch square.