The paper processing kit comprises a 240 volt motor base plus two drums which accommodate 8x10 and 12x16. These sizes are maxima; the drums can be used to process smaller prints. The kit works for both BW & colour papers; it's simply a matter of choosing the appropriate materials. This kit was my back up in case the bench-top processor ever failed. Fortunately, there never was any failure; as a result the processing kit has never been used and remains in as new condition.