Shell material: high permeability corrosion resistant PC/Bayer 2805, Germany. Key material: silicone Waterproof/use: 40m (extreme)/The waterproof shell adopts symmetrical lock catch, which has very reliable structural performance. The shell body is thicker and more solid, and is not easy to deform. It can not only dive, but also protect your camera and lens in an all-round way, so as to prevent your camera from scratching, falling and scratching Lens material: optical imaging toughened glass is used, and the transmissivity of the lens material is close to 92%. After coating AR, the transmissivity of the lens is increased to more than 98%. After coating, the waterproof film is coated, and the water drop angle is up to 115 degrees, to ensure that no water drops remain on the lens surface and affect the shooting effect Waterproof ring material: amorphous high activity silicone Material of connecting shaft between main body and rear cover: high hardness 304 stainless steel Product size: L 155 * W 70 * H 52mm