HIGH QUALITY Material Sound Foam. Maintain their sound proofing features. They only need to be taken care occasionally through dust vacuuming. For professional acoustic control, sound dampening, acoustic treatment, noise reduction - Reduce waves, reverb and flutter echoes in smaller to medium sized rooms. Great for spot treating sound on walls in your studio or office - For use in recording studios, control rooms, Offices home studios, home entertainment theaters, Home Offices Size:30*30*5cm Material:Polyurethane foam Colour:Blue + black Package Contents: 6 * blue sound absorbing cotton 6 * black sound absorbing cotton Only the above package content, other products are not included. Note: Light shooting 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.