Secure Snap-On Design with Anti-Slip Silicone Lining Each filter features an inner silicone strip that adds friction and stability, ensuring a secure snap-on fit during high-motion activities. Designed to stay firmly in place while biking, skiing, surfing, or vlogging on the move. Premium HD Optical Glass with Multi-Layer Coating Built with multi-coated HD optical glass that delivers excellent clarity and minimal image distortion. The protective coatings reduce fingerprints, repel water and oil, and make cleaning quick and easy in outdoor environments. ND & ND/PL Filters for Smooth Motion and Proper Exposure ND filters help control light in bright conditions, preventing overexposure and enabling cinematic motion blur. ND/PL combo filters further reduce glare while managing exposure-ideal for dynamic sports shooting, beach scenes, and high-contrast lighting. Color: Black Material: Glass+Metal Package Contents: 4*ND/PL Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.