Specifications: Material: environmentally polyurethane foam Color: black Size:30x30cm（12”x12") Thickness:5cm / 2" Feature: Adopt professional acoustic control, sound suppression, acoustic processing, noise reduction, the acoustic foam is able to reduce the waves, reverb and flutter echo in small and medium-sized rooms Odorless, Non-toxic, Formaldehyde-free, Class B1 Flame Retardant, Corrosion Resistant, Anti aging, Safe acoustic tiles for indoor use Symmetrical wave design,can decorative your wall in greatly These durable sound panels are excellent at absorbing sound energy, reducing reverb, echo and mid high frequency noise These sound dampening panels are cuttable and easy to mount using 3M spray adhesive or 3M vhb double sided tape(sold separately) Specific acoustic characteristics, make it not only has the sound absorption characteristics effectively, without any harm to human body Application: Great for spot treating sound on walls in your studio or office Suit for use in recording studios, control rooms, Offices home studios, home entertainment theaters, Home Offices Packaged Included: 50Pcs Acoustic Panels