EQ Acoustics Spectrum 2 Q5 Tile 4 Pack Blue, Acoustic Element, Absorber core made of 100% polyester with textile cover, Highly robust, Non-allergenic and contains no irritants, Odourless, Most efficient in the mid and high frequency range, Wall and ceiling installation possible with Flexi system (hook-and-loop fastener for wall mounting), Fire safety standard of core material: EN13501-1:2007+A1:2009 [B - s2, d2], Fire safety standard of fabric cover: BS476 Class 1, Dimensions: 575 x 475 x 50 mm trapezoidal, Colour: Blue, Package quantity: 4 Pieces@+*Suitable fastening materials (not included):*@+@+, Flexi Blocks: Article no. #442768#, Flexi clips: Article no. #442769#, Flexi Hooks: Article no. #442770#