Professional Sound Absorption: With its unique pyramid 3D acoustic design, these acoustic foam pannels increases the contact area with sound, leading to excellent absorption of flutter echoes, reverberation, and standing waves. Compared to 1inch panels, the 2inch panels provide significantly better acoustic treatment. They improve sound clarity and reduce harshness when installed on walls or ceilings. Perfect for studio recording, podcasts, interviews, meetings, and gaming rooms. Self-Adhesive: Our soundproof foam board features a self-adhesive layer. No need for additional glue or tape. Just peel and stick anywhere. Strong adhesive ensures secure attachment on walls without worry of it falling off. Rapid Expansion: The acoustic panels in vacuum-sealed packaging simply need to be separated from the interlocking state and placed in a well-ventilated area. Typically, they will fully expand to their complete shape and size within 24 hours. tip: With adhesive backing, adhesive color is random, Cannot be chosen the specific color. size: about 30 x 30 x 5cm Material: Polyurethane colour: Black Package Contents: 24 x Acoustic Foam Panels Only the above package content, other products are not included. Note: Light reflection 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.