The Jobo 2800 Series Print Drums are designed to allow you to be able to process prints in the daylight, regardless of whether or not you're using a Jobo processor (by using them with the Roller Base).
Also, like Jobo film tanks, these drums are modular, which saves you money by being versatile.
The 2850 Print Drum holds up to 16-4x5", 8-5x7", 4-8x10", 1-11x14" or 1-16x20" prints, and requires a minimum of 200ml worth of solution.