1.Full Protection for X4 Lens - The Lens Guard compatible with Insta360 X4. Can effectively protect the x4 camera lens from bumps, damage, scratches and drops. Reduce the daily wear and tear of the lens, prolong the life of the camera. Keeps the lens clean and stops dust, fingerprints and smudges from adhering to the lens surface, ensuring quality shots. Please note that this is a replacement product, not an OEM product 2.9H Optical Glass Protective Lens Guard - Optical tempered glass material, hardness of 9H, harder than plastic protective lens cover. No longer afraid of scratching, more durable than plastic protective mirror, better light transmission. Lens material transmittance close to 92%, AR coating layer enhance the lens transmittance increased to more than 98% 3.2H Plastic Protective Lens Guard - Made of high quality plastic material, hardness of 2H, durable and sturdy (plastic surface hardness is generally 1H). Lens transmittance close to 90%, surface hardening (AS) treatment, AF plating, AR coating layer enhance the lens transmittance increased to near 97% 4.Easy to Install - Adopting snap type mounting, convenient and easy to use, easy to install and dismantle, precise adaptation, will not affect the operation and function of the camera, protect the lens from the external environment