The PolarPro Iris Filter Expansion Cinema Series (3-Pack) for the Iris Mobile Filter system, allows you to capture cinematic shots all through your mobile phone. These filters alsohave an aluminum grip, making filter swaps, easy and fingerprint free.The pack includes 3 filters, The ND64, ND128, and ND256. These sophisticated filters provide outstanding color neutrality and sharpness.The ND64 (6 Stops) provides a low ISO, and is best shot while in a bright environment/harsh lighting.The ND128 (7 Stops) has an ISO to your preference. Recommended for long exposure photography, and blur motion natively.The ND256 (8 Stops) also has an ISO to your preference. Just like this ND128, this filter is best used for long exposure photography, and blur motion natively.The Iris Filter System is not included, however, we made it easy for you to purchase the system right here