This 25dB acoustic roller shutter is created from a double-skinned polyester powder coated 95mm slat using a polyurethane foam Main. See Air FlexThe common finish for our roller shutters in Stoke-on-Trent is 22 gauge galvanised metal. All guides, canopies, flags and L rails etcetera can also be galvanised metal to get a long-lasting, effective oper