The Premium K&F Concept® Ultra Slim CPL Green Multi-Coated polarizing filter was made from coated, optical branded real glass (Green Multi-Coated) and integrated into a precision aluminum frame. The selection of the manufacturing materials and the coating process was precisely coordinated in order to meet the highest requirements in terms of reflectivity, light transmission and visual appearance. Batteries must not be disposed of with household waste. You are legally obliged to return old batteries so that proper disposal can be guaranteed. You can hand in used batteries at a municipal collection point or at a local retailer. You also have the option of returning used batteries from our articles with sufficient postage or returning them free of charge to our address at the following addres