Each Revolution filter is color coded to allow for quick and easy identification and made with Kase's KW Optical glass. KW Optical glass features double-sided waterproof nano-coating and low color cast, as well as a toughened shock resistant coating to help create a highly durable and easy to care for filter. The Circular Polarizer helps to reduce glare and reflection from non-metallic surfaces such as sunlight on water or in windows and can also help to saturate the landscape in an image resulting in foliage, clouds, and skies that pop with bold realistic colors. The ND filters create an equal darkening of the entire image which can help to balance out light and result in a more desirable photo. With higher stop ND filters, you can use a longer shutter speed and allow more light to enter the lens without washing out the image and doing so can help to capture movement in the picture such as flowing water or clouds moving across the sky, resulting in a smooth flow of water or soft cloud covering. The Revolution filter kit includes two adapter rings; a traditional threaded magnetic adapter ring and an inlaid magnetic adapter ring that is installed inside the lens and causes no extra thickness between the lens and filters, helping to reduce vignetting. This custom kit also includes a convenient and reliable double sided Kase cleaning brush and Kase air blower to help keep both your filters and lenses free of dust when in use. The double sided Kase cleaning brush features a round cleaning brush for smaller circular filters, and a larger rectangular brush for square and rectangular filters.