The pyramid design helps up the acoustics a bit better and look stylish. The cut and shape of the panels are consistently symmetrical and even. The pages are cut so that they fit together perfectly. These acoustic sound panels are intended for absorbing and eliminating sound, echoes, flutter echoes, standing waves, reverb, etc. Perfectly good or recording studio, game room, musical instrument studio, podcast, office, school, control room. Besides, these wall foam panels can reduce noise somewhat in conditions of installing enough panels, can't completely block noise. Easy to install, just attach double-sided tape or glue (not included) to the back of each sound proof padding and install to the position. Easy to shape and cut to smaller size, you could create different styles of decorative wall art in your favorite space! BTW, pls make the wall is clean and in good conditions installation. Colour:Black Material:Polyurethane Size:.25x25x5cm Package Contents: 36 * Acoustic foam Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.