high polished, high transmittance, if you need coating, we have advanced coating equipment Material: k9, B270Tolerance: -0.02mm-0.008mmThickness: 1.0mm, or upon requirementsurface quality: 20/40(high precision), 40/60(standard) We can offer various shape and size Optical components.Our purpose is customization, so you just need to send specification. We have a good quality and competitive price.