The ND16 Filter Set from Insta360 equips you with two ND filters for both of your X5 lenses to reduce light hitting your camera's sensor for greater creative control over your footage. The ND16 filters cut light hitting your sensor by four stops for bright or cloudy conditions. Once attached, the X5 automatically recognizes the filters and corrects your image. The filters are constructed of tempered glass for a scratch- and water-resistant surface.