A twin-wire former captures the stock jet in the converging nip formed between two fabric-covered rolls. These are also sometimes referred to as "gap" formers. There are four types of twin-wire formers - blade, roll, hybrid and roll/blade. Each has its own challenges and strengths. With twin-wire formers, it is especially important to define the desired sheet properties, and then work with equipment and fabric suppliers to configure, control and operate the design that is selected.