A. Acoustic foam is used to remove reverberation and sound reflections, and provide sound insulation. It is suitable for sound studios. It is durable, soft, non-toxic and can be used for a long time. B. It also reduces slap-back and room ring when used in medium-sized areas like isolation booths, recording booths, sound studios, etc. C. Acoustic foam is suitable for walls, ceilings and doors, and other various places such as theaters, recording studios, gyms, subways, kindergartens. It can also be used as a decoration. D. Colour: Silver grey. Material: Polyester fiber. Size: 30cm*30cm*9mm. E. Package Contents: 12 sound absorbing panels. Only the above package content is included, other products are not included. F. Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1 - 3cm.