MRC-910-G25: 1-inch diameter high reflectivity diffuse scattering gold, mounted in a 2-inch diameter holder without window
MRC-910-GW: 1-inch diameter high reflectivity diffuse scattering gold, sealed in 2-inch diameter holder with optical window
MRC-910-G40: 1.7-inch diameter high reflectivity diffuse scattering gold, mounted in a 2.25-inch diameter holder without window
MRC-910-G50: 1-inch diameter high reflectivity diffuse scattering gold without any housing