https://shanghaijingsheng.en.made-in-china.com/product/kmnYXFwcXRVP/China-10-10-10mm-Optical-Bk7-K9-Glass-Polarizing-Beamsplitter-Cube-Prism-Extinction-Ratio-200-1.html
10*10*10mm Optical Bk7/K9 Glass Polarizing Beamsplitter Cube Prism Extinction Ratio200: 1 - Cube...
polarizing beamsplitter cube