Shell material: Hardened PC, reinforced with fine lines of 10 on the inside and outside, making the product scratch resistant, textured, anti flower and 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 of AS waterproof and anti fingerprint film, and AS with a hard film. The surface hardness is 5H, which can match the hardness of ordinary glass and is scratch resistant, achieving worry free photography with just one mirror in hand. 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<br><br>Name:For insta360 X4 Fully Invisible Submarine Shell Waterproof: 50M Product weight:148g Colour:Transparent Material:PC Size:155x80x85mm<br><br>Package Contents: 1 * Actiion Camera Diving Case<br><br>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.