These are the white cap alternative. These do not come with the "Flux valve" that goes in the hole part of the mask. The flux valve is included with your mask. These are the different settings for the different elevations. Each cap has a different hole that allows more or less air to flow depending on the elevation desired. Please note that these cannot be added to a sleeve to function as a mask. The MASK needs to be purchased for breathing apparatus (item etm-1007).