Gyptone Big Quattro 41 Ceiling is perforated plasterboard comprising a square cut-out design with an acoustic tissue backing used to help achieve high levels of sound absorption. Gyptone Concealed Ceiling systems using Gyptone Big Quattro 41 allow you to create large ceiling surfaces without visible joints. More importantly, the ceilings reduce reverberation time, and improve speech intelligibility in a given room. Key facts Dimensions: 1200 x 2400mm Thickness: 12.5mm Edging: 2 tapered edges Perforated ratio: 16% Hole size: 12 x 12mm Weight: 8kg/m2 NRC: 0.5 Application Suitable for wide use in all types of buildings, and especially good for areas that need high levels of sound quality, such as auditoriums, conference halls, and karaoke rooms among others. Manufacturing Standards GB/T 9775-2008