Vicoustic Flexi Wave Ultra 60 Brown Oak, Set of 6 Absorbers / Diffusers, Hybrid acoustic panel that acts simultaneously as an absorber and diffuser, Professional attachment system (VicFix J Profile), High quality MDF with scratch-resistant melamine foam, Optimal effective range (absorption): 200 - 630 Hz, Dimensions: 595 x 100 x 150 mm, Set includes 6 pieces Flexi Wave Ultra 60, Colour: Brown Oak, 12x VicFix J Profile 80 mm attachment system