3mm thick black acrylic case pieces for the High-performance 10-Octave Stereo Grahpic Equaliser. Six pieces are included which make up the case, as per the articles in the June and July 2017 issues. The exterior surface is matte, to resist fingerprints and scuffing. It's held together with tapped spacers and machine screws. Note: additional parts shown in the image are not included; this set only includes the cut acrylic.