The Simma-Roller Action Agitator ensuring even distribution of chemistry across the prints in all directions. The Simma-Roller is compatible with many sizes and brands of processing drums. comes with 1, 8 x12 Simmi drum 2, 8.5 x 4 cibachrome drums 2, 14 x 4 cibachrome drums 4 end caps total, enough for 2 drums cibachrome processing at a time Will Ship buyer pays shipping