features:<br />--100%  and high quality.<br />--deformation rebound rate， long service life.<br />---waterproof， anti- moisture， good air permeability.<br />--2.5&amp;quot; convoluted foam is most effective on mid-to-high frequency ranges.<br />--anywhere to help block sound and prevent echoes inside the room.<br />--these wall panels provides strong noise reduction， good for studios， recording studios， vocal booths， control rooms.<br />--use: perfect for use on corner walls， corner ceilings， etc.<br /><br />specifications:<br />material: polyester<br />size:30*30*6cm/ 11.81*11.81*2.36&amp;quot;<br />color: black<br />quantity: 4pcs<br />product care: ocnal vacuuming of dust<br /><br />packaged included:<br />4 x soundproofing egg crate foam