Optical glass with high definition image quality, effectively isolate water droplets and water vapor. Aluminum alloy frame is more practical, aluminum alloy frame is reliable and firm. Wear- and scratch-, sturdy and more . CPL Polarizer - CPL polarizer can harmful reflections, improve the clarity of the image, increase the contrast of light, color saturation, such as , white clouds, etc., so that the color is more vivid. ND Scaler - ND scrim can reduce the amount of incoming light, lower the shutter speed, prevent overexposure, also can resist scattered light, improve the color saturation of the picture, you can clouds, silky flowing water, empty streets. Commonly used in street scenes/natural scenery/tourist attractions/ special effects . Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Colour:Dark Gray Material:Light aluminum frame optical glass Package Contents: 3 * Lens Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.