The black sound panel is 25 x 25 x 5cm for each tile. package comes with 36 pack acoustic panels. 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, and if you to remove, just detach each panel and reinstall to the new location. With strong resilience, foam panels can quickly expand to full size they are unpacked. Usually they to normal shape immediately and you 't see any worry of the vacuum sealed package for these panels. These acoustic foam panels are specially designed as wedge shape whose contact area is much with sound, which naturally increase their to control flutter echoes, waves and reverb. They are perfectly good for improving sound quality and in acoustic room like recording studio. 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. size: 25 x 25 x 5cm Material: polyurethane colour: black Package Contents: 36 x 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.