Silicone material no damage to the lens interface, tight fit the interface no easy to fall off. To protect the interface where lens module and action camera connects and prevent oxidation. To effectively protect for insta360 AR lens interfce from water drops, dust, etc. To protect conductive particles from dropping into the interface and damaging for Insta360 AR lens module. Skin feel, protect your beloved camera from scratching and rubbing off paint The soft material is easy to disassemble, and it has a waterproof and anti-drop effect. The appearance is smooth and comfortable, and the texture is obvious. Wear-resistant and drop-resistant, it can definitely play a good role in protecting your camera. Applies to: For Insta360 ONE R camera accessories. specification: Material: Silicone Size: 3.8x3.9cm / 1.5x1.54in Colour: Black Compatible models: Insta360 ONE R 4K Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 1 x silicone lens cap Note: The camera is not included in the sales.