This listing is for 3 stackable lens hood this phot r p series modular stackable lens hood is a plastic hood which acts as a lens shade and clips directly on to the p series filter holder it is possible to stack multiple hoods to create a longer lens shade for telephoto lenses attaches to outside of filter holder doesnt impede graduated filters movements stackable assuming a 24 x 36mm format full frame dslr or 35mm camera use 1 hood for a 24mm or 28mm lens use 2 hoods for 35mm lenses