This RAM ALUDUCT Low Noise Ducting is super flexible. It is made from aluminum and polyester and is gives 3 reinforced layers of protection. The laminated layers have been encapsulated in a high tensile steel wire helix. The ducting will be strong in both shape and light resistance. It offers less drag than many other brands of ducting which are on the market, which means less noise and you will see a reduction in the pressure drop. It comes in 102mm, 152mm, 203mm and 254mm individually boxed in 10m lengths. This ducting has been tested for fire resistance and in the event of a fire, no toxic gases are emitted.