HIGH DENSITY AND ECO-FRIENDLY: Made from high density 100% polyester fiber, 300lbs per cubic yard, better Sound Insulation than soundproofing foam Soundproofing and flame retardant, odorless, non-toxic, non-slip, corrosion-resistant, and anti-aging.BEVELED ACOUSTIC DESIGN: 30 x 30 x 0.9cm. Stylish beveled panel design doubles up as decorative wall art in your favorite space, which allows you to leave countless beautiful memories in a comfortable environment.EASY TO INSTALL: Both general purpose spray adhesive and double-sided tape work. Simply attach spray adhesive or double-sided tape (not included) to the back of each panel and adhere to the desired position.WIDELY USE: 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. Easy to shape and cut to size, altering won't affect performance. Or use it on the ceiling, behind the TV or under your rug Colour: blackMaterial: polyester fiberSize: 30 x 30 x 0.9cmPackage Contents:12 x sound insulation boardOnly the above package content, other products are not included.Note: Light 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.