EQ Acoustics Project Corner Traps grey, 2-piece set low-frequency absorber set, High performance acoustic tile, works on a broad range of frequencies that extend down into the all-important lows, designed to fit neatly into the vertical and horizontal corners, features an air gap at the back, Noise Reduction Coefficient (NRC): 0.85, Fire: UL94 HF1, no fixing included, Dimensions: 600 x 300 x 300mm (L x D), color: grey/anthrazit, set contains 2 units