Vicoustic VicPattern Ult Wavewood Black, Set of 3 Absorbers / Diffusers, Acts as an absorber and diffuser at the same time, Professional attachment system (VicFix J Profile), Made from VicPET Wool, MDF and scratch-resistant melamine foam, Effective range (absorption): 500 - 4000 Hz, Maximum effectiveness: 630 - 1600 Hz, Dimensions: 595 x 595 x 50 mm, Set contains 3 pieces of VicPattern Ultra Wavewood, Colour: Black matte, 6x VicFix J Profile 80 mm attachment system