... models including 28/4,14/2,13/3,59/5.38.5/4,etc.A very popular acoustic system ... , Painted Ral/NCS colorRegular Size128*2440*12/15/18mm, 197*2440*12/15/18mm (or as client request)Edge FinishTongue ... & Groove, SquareBackAcoustic Black Fleece (or as client request)Regular Model13-3 ... ,14-2,17-4,18-3,28-4,29-3,38.5-4,40-3,59-5,60-4 ( ...