Complying with the latest ISO specification, we use polycarbonate glazing with the highest standards of scratch resistance. PHOTOCHROMS : PC (Mold-injection polycarbonate) Transmittance: 92% for CLEAR glass, 14-18% for BLACK (CAT.3) Thickness1.7mm MIRROR : PC (Mold-injection polycarbonate) Transmittance: 92% for CLEAR glass, 24-27% for MIRROR (CAT.3) Thickness1.7mm