These bellows are produced by sewing together fabric reinforced elastomer canvas. No mould costs normally incur. Wire rings sewn inside and spiral springs arranged on the outside give the bellow its shape and stability. Zips and Velcro fasteners are used for easy attachment.
These bellows are resistant to ageing, weathering, splashing oil and water and are largely rot resistant. Typical applications are delivery hoses for powdery or grainy materials in cement works, mills and salt works. Oil resistant types are used as covers for pneumatic cylinders in offshore applications as well as mast covers on sailing boats.