Features: Outstanding Sound Absorption: Distinct pyramid 3D acoustic design, these panels increases the contact area with sound. Therefore, they does an excellent job a absorbing flutter echoes, reverberation and standing waves. Compared with 1 inches panels, this 2 inches panels make much more difference in acoustic treatment. Specifications: Every package comes with 8/12/24 pack set black pyramid shaped acoustic panels. The dimension is 12 x 12 inches of 2 inches(from bottom to its peak)for each tile. High density (25kg/m3), flame retardant, and made of non-toxic polyurethane foam, we are committed to providing an affordable and healthy sound panel for acoustic treatment. Rapid Expansion: What makes our acoustic panels unique is that they puff up to full shape and size rapidly. Usually it takes less than 36 hours to expand, but may take longer sometimes. Just separate the panels from interlocking status and let them sit in a well ventilated place, they will quickly be what you want. You won’t see any worry for the package of vacuum sealed. Self-Adhesive Design: With glue on the back, easy to install on walls, ceilings, and walls. Suitable for various smooth surfaces. Wide Application: This pyramid acoustic foam is widely used in recording studio, control room, meeting room, game studio, basement, musical instrument studio, concert room, home theaters, facilities, vocal booth, etc. We are confident for their quality and effective performance in improving sound quality and clarity. Specification： Product Name: Studio Acoustic Soundproof Foam Material: High Quality Foam Color: Black, Red, Gray (Optional) Profile: Triangle Qty: 8,12,24 Pcs Dimension: 30x30x5cm / 11.8x11.8x1.96 inch Package Included: 8 x Acoustic Foam Or 12 x Acoustic Foam Or 24 x Acoustic Foam