Premium Brass Shock-Proof UV Filter for enhanced lens protection and image quality Durable Premium Brass Ring with a 3.1mm ultra-thin frame design for easy grip Constructed with high-quality Schott B270 glass for superior light transmission and hardness Features a meticulous 36-layer coating for optimal light transmission up to 99.4% Dual protection with double-sided, waterproof & oil-proof features for handling harsh environments Essential photography tool that not only safeguards your lens, but also improves image clarity and brilliance