There are two types of offset printing services or machines in common use for publication today: sheet-fed offset printing and web offset printing. In sheet-fed offset printing, individual pages of paper are fed into the machine. The pages can be pre-cut to the final publication size or trimmed after printing. In web offset printing, larger, higher-speed machines are used. These are fed with large rolls of paper and the individual pages are separated and trimmed afterward. Sheet-fed offset printing is popular for small and medium-sized fixed jobs such as limited-edition books. Web offset printing is more cost-effective for high-volume publications whose content changes often, such as metropolitan newspapers.