【Reply 】 The size of each sound dampening panel is 30cm 26cm 1cm/ 30cm 30cm 1cm/ 30cm 40cm 1cm (single side length). 12/24x Self-Adhesive Acoustic Wall Panel Tiles Studio Soundproof Insulation Pads. Our panels have passed the internationally recognized ilac-MRA formaldehyde test, ensuring they will not cause any harm to people and pets.
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