Businesses in the glass fibres category manufacture, process or supply fine strands of glass used in insulation, reinforcement and industrial materials. Products may include glass fibre yarns, chopped strands, woven fabrics, mats and rovings, as well as finished insulation products. Some suppliers also provide specialist grades or formats intended for particular manufacturing processes and working environments. Glass fibres are commonly used to reinforce plastics and resins in composite products, including mouldings, panels, pipes and components for construction, transport and marine applications. They are also used in thermal and acoustic insulation, filtration and other industrial applications. Depending on the business, services may include cutting or converting materials to specification, technical advice on product selection, and supply of associated resins or composite-making materials. Glass fibres are distinct from optical fibres, which are designed to transmit light and data.