Fotasy 49mm Camera Filter Stack Caps Filter case protect filters from dust and scratches while they are not being used Simply screw the filters together, then screw these stack caps on the top and bottom. Compatible to lens with 49mm thread size, and 49mm Filters Material: Metal Brand: Fotasy Filter case protect filters from dust and scratches while they are not being used^ Simply screw the filters together, then screw these stack caps on the top and bottom.^ Compatible to lens with 49mm thread size, and 49mm Filters^ Material: Metal^ Brand: Fotasy