The reflective surfaces are coated with high-quality copper and silver layers to enhance reflectivity and durability This coating combination improves light efficiency and extends service life under frequent field use This 1 inch (25.4mm) corner cube prism is made of premium optical glass, providing excellent clarity and stability for precise measurement tasks in surveying and metrology applications Specially designed for total station surveying instruments, this corner cube prism offers high accuracy and stable reflection performance, making it suitable for engineering measurement, construction layout, deformation monitoring, and other professional applications, Weight: 110.0 pounds, Manufacturer: IJSDNVJNDX