FOTGA New Square Filters Lens Hood for Cokin P Series Holder This hood is compatible with Cokin P series filter holder. It simply fits onto the filter-holder by pressing on the upper and lower parts of the lens hoodThis hood is compatible with Cokin P series filter holder. It simply fits onto the filter-holder by pressing on the upper and lower parts of the lens hood Stackable design allows for the attachment of several of these hoods to one another, depending on the focal length of your lens, to allow for greater protection Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact Packing including: filter hood for cokin p series x1