This method is suitable for the production of hollow mouldings. A flexible bag, often manufactured from silicone rubber, is placed inside the structure and inflated to apply consolidation pressure. The part can be cured in an oven with temperature and pressure applied for consolidation, using compressed gas or fluid. This method is often applied to simple sections such as tubes, e.g. sail boat masts, but it should be noted that the tooling must be rigid enough to withstand the internal pressure without distorting.