Abstract: A printing unit for a web-offset press is disclosed. The printing unit comprises plate and blanket cylinders arranged in couples to print on both sides of a paper web passing between each pair of print couples, and an inking system associated with each print couple when the printing unit is in an operative position operable to supply ink to the plate cylinder. The printing unit is separable into a primary module carrying the plate and blanket cylinders and a pair of secondary modules carrying the inking systems. Other aspects of the invention include a printing press and a folder unit for use in a printing press.