Material: Gold-Plated Silicon Diameter: 38.1mm/1.5 ; Thickness: 5mm/0.2 ; Shape: Plane;Transmittance: >99.2% The biggest advantage of Si mirror is it has high damage threshold. So it can be used in some high power laser systems such as co2 laser machines. Si mirror has high reflectance and low flatness. Using the high quality surface coating will protect the layer of Silicon not to damage, and increases the Silicon layer reflection efficiency. It can be applied to laser machine of higher power between 40W-400W. UPC 671875155197 Color Gold Brand Name MCWlaser Style Name Laser Manufacturer Shanghai Top Nine Industiral Co.,Ltd Material Type SI Operation Mode Automatic Item Dimensions L x W 1.5 L x 1.5 W Manufacturer Part Number LM1-SI-38