The Holga Lens and Filter Case lets you Create Holga-esque images using your iPhone 4 or 4S. Snap the case over your iphone and then spin the filter disk to select which special effect lens you'd like to use.Special Effect Lens and Filters Included:Standard Holga VignettDual Split Image LensTriple Split Image LensQuadruple Split Image Lens60mm Macro LensYellow Filter with Clear CenterBlue Filter with Clear CenterGreen FilterRed FilterRed Filter with Clear Heart Shape Center