Shell material: Hardened PC, reinforced with fine lines on the inside and outside, making the product scratch resistant, textured, anti-fingerprint. Lens material: PMMA, with a light transmittance of 95%. After being coated with AR anti-reflective film, the light transmittance can reach 98%. It is made with AS waterproof and anti-fingerprint film, and AS hard coating. The hardness is 5H, which matches the hardness of ordinary glass and is scratch resistant, providing reliable protection for photography with just one lens. Waterproof ring material: Amorphous high-activity silicone Material of the connecting shaft between the main body and the back cover: High-hardness 304 stainless steel Name: For X4 Fully Invisible Submarine Shell Waterproof depth: 50M Product weight: 148g Color: Transparent Material: PC Size: 155 x 80 x 85mm Package Contents: 1 x Action Camera Diving Case Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowance is +/- 1-3cm.