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The Econo-cage is our disposable cage, with the air grommet the cage is easily placed in the Rair HD Super Mouse 750 and Rair DH Super Mouse 1800 ventilated racks. Without the air grommet the cage can be used as a disposable filter top cage. The Econo-Cage is order complete with bottom and filter top. Parts and cages including bedding can be ordered separately, for more information please fill out our contact form, click here.