Businesses in this category manufacture plastic products used in building, renovation and property maintenance, other than products covered by more specific building-material categories. They may make components from materials such as PVC, polyethylene or polypropylene, using processes including extrusion, moulding, cutting, welding and assembly. Production can range from standardised items made in batches to components manufactured to customers' specifications. Typical products include plastic trims, profiles, cladding and fascia components, mouldings, access covers, ducts, cable-management products, building fittings and other formed or fabricated plastic parts. Some manufacturers supply semi-finished profiles for further processing, while others provide finished components ready to be fitted on site. Customers commonly include builders, building-products merchants, specialist installers, contractors and manufacturers of construction systems.