Optical glass with high-resolution image quality, effectively isolates water droplets and steam. Aluminum alloy frame is more practical, aluminum alloy frame is reliable and sturdy. Abrasion-resistant and tear-resistant, robust and more ND Filter. ND filters can reduce incoming light amount, shorten exposure time, prevent overexposure, also resist scattered light, improve image color saturation, you can use it for clouds, silk-like flowing water, empty streets. Usually used in street scenes/nature landscapes/tourist attractions/special effects CPL Polarizer. CPL polarizer can eliminate harmful reflections, improve image clarity, increase light contrast and color saturation such as white clouds etc., making colors more vivid. Due to different batches, there may be variations in the product's appearance, color, and printed text, which do not affect its functionality. Color: Dark gray Material: Lightweight aluminum frame with optical glass Package content: 3x Objective filters Only the above package content included, other products are not included. Note: Light reflection and different screens may cause the color of the object in the image to slightly differ from the actual product. The allowable measurement error is +/- 1-3 cm.