High-quality UV protective filter with shock-proof design for optimal lens protection Constructed from Schott B270 glass with a light transmission rate of up to 99.4% Aviation-grade aluminum ring frame with a sleek, uniform surface gloss Ultra-thin 3.1mm frame design with knurling for easy grip and no vignetting 24-layer coating to reduce reflection and increase light transmittance Double-sided waterproof and oil-proof for resilience in harsh environments