12 pcs. Corner sound-absorbing cotton in recording studios in arc-shaped internal sound-absorbing material for noise reduction1. Help reduce reverberation, floating echo, bad sound reflection, unnecessary noise, very suitable for small and medium-sized rooms, theater halls, recording studios, churches or offices.2. Acoustic bass trap helps eliminate reverberation and echo bass sound. They can reduce unnecessary reflections, attenuate and disperse low- and mid-frequency sound waves in the room, reduce interference, and improve audio clarity3. The sound insulation of the foam is flame retardant, which prevents the spread of fire and reduces its strength. The production material is formaldehyde-free, very non-toxic and durable4. Used for acoustic/isolation shielding, very suitable for high-fidelity studios, recording studios, home theaters, rehearsal rooms, YouTube/podcast recordings, etc. Color: Black Material: Polyurethane Size: 12x12x24cm Package Contents: 12 x Foam Sound InsulationOnly 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 error is +/- 1-3cm.