PGYTECH Osmo Pocket UV Filter A nanometer double-sided multi-layer vaccum coating process helps protect the lens for improving clarity & colour effects. Hardened super waterproof and; Oil proof coating The filters have gone through multiple grinding & polishing processes aswell as a scratch resistant process. German Schott Optical Glass In order to meet the rigorous requirements of professional photographers PGYTECH has used the filters from the finest Schott glass. The filter also uses a magnetic system for its application to the gimbal these means it is very easy to swap around the lenses if you have purchased a set. Whats in the box?. 1 x CPL Professional Filter..