This is the top-of-the-line lens protection filter, the "WR CERAMIC PROTECTOR" (77mm diameter) from SIGMA. Made in Japan, a mark of quality. Reference: The price of a new one is approximately 15,000 yen. It uses a special material, "Clear Glass Ceramic," which is harder than sapphire crystal glass. With overwhelming strength, it firmly protects the front of your valuable lens from unexpected impacts. ▼ Features of this filter: 【Ultimate Protection Performance】 Employs "Clear Glass Ceramic," an innovative material with over 10 times the strength of conventional products. It is scratch-resistant and boasts extremely high durability. 【Optimized Optical Performance for SIGMA Art Lenses】 It features an ultra-low reflection coating that maximizes the performance of SIGMA's flagship "Art line" lenses. 【Excellent Maintainability】 It is coated with a water-repellent and anti-fouling coating that strongly repels water droplets and fingerprints, making maintenance very easy. ▼ Condition and Accessories: 【Condition】 Used only for testing, and has been handled with care. There are no scratches or peeling of the coating on the filter glass surface, and it is in very clean condition. 【Accessories】 Filter body, dedicated case. Please feel free to ask if you have any questions. #SIGMA #Sigma #LensFilter #ProtectionFilter #Protector #77mm #MadeInJapan #ArtLens