Turning Mirror, Silicon Protective Silver - Model #: TMS-2020-PS 2.00"Ø X .200" (5.0mm) Edge Protective Silver Coating R>99.0% average @ 9.0µm to 12.0µm and Reflectance for visible regions also from .450µm to .650m optimized for all AOI operation (also has low phase shift for 10.6 and 9.4µm)