*Material ZnSe, Si, Ge
*Dimension tolerance +/-0.20mm
*Thickness tolerance +/-0.20mm
*Surface Quality 60-40
*Flatness  λ/4@633nm
*Clear Aperture 80%
*Crystals directional precision  5 min
*Bevel 0.3+/-0.20mmx45 degree
*Coating Optional