The Bright Tangerine Strummer DNA 5.65″- 2 Stage Cassette is an optional accessory to increase the amount of filter stages. Its patented quick release design allows you to push the tabs and engage in seconds and lets you add as many stages as you’d like for complete creative control and if weight and an increased field of view is important, you can easily remove them too. The desert ready filter stages are rotatable and maintenance free and allows the use of round filters in industry standard donuts. This product is built for maximum durability using hard anodized and precision cut aluminium, fitted with 4 high grade stainless steel roller balls that snap lock into predefined positions and contains a filter and rotation lock on the side surface.