Kit Contents: ND8 0.9 (3 Stop) - ND64 1.8 (6 Stop) - ND3.0 ND1000 (10 Stop) ? Clamshell Filter Case High quality K9 optical glass Multi-coated (10 Layer) to prevent internal ghosting and reflections. Nano coating provides an additional layer that results in an improved beading effect when in contact with water or oil for greater cleaning efficiency. Front frame is threaded for use with multiple filters / hoods / caps