Edge-welded bellows are made from separate round discs, welded together in segments. Welded bellows provide the greatest stroke and dynamic flexibility. Welded bellows hoses can have a virtually unlimited length and can be manufactured in a variety of different thicknesses and materials as special-orders. Formed bellows are made from a single piece of very thin tubing. They are designed to compensate for static misalignments where the tubing is not actively and repeatedly being flexed. The inherent design of formed bellows limits their length.