Dive Case For Insta360 X5 Camera Invisible Diving Housing Cover 50 Depth Waterproof Underwater Protection Shell for Insta 360 X5. Made of optical tempered glass with a hardness of 9H. The optical tempered glass material is about ten times harder than a plastic protective lens. Generally, the surface hardness of plastic is only about 1H, while that of tempered glass can reach 10H. You don't have to worry about scratches anymore. It is more durable and has better light transmittance than plastic protective lenses.