Set of 12 sheets. 【High-Performance Material】AUSLET soundproofing sheets are made of environmentally friendly, high-quality polyester fiber, and their high-density properties provide excellent waterproof and moisture-proof performance. Odorless and excellent sound absorption, these soundproof sheets also have heat insulation functions. They improve the operating efficiency of air conditioning and achieve energy-saving effects. Non-compressed packaging is used, so they can be used immediately after opening. 【High Density, 9mm Thickness】The sound insulation effect is determined by the surface density of the sound-absorbing material. By increasing the thickness to 9mm, the surface density reaches 200kg/m³, doubling the sound insulation effect compared to ordinary soundproofing materials. It enhances acoustic effects such as sound absorption, noise, reverberation, flutter echo, standing waves, and reverberation. 【Wide Range of Application Scenes】Adhesive sound-absorbing panels are suitable for various spaces: reducing noise and creating a quiet environment in homes, game rooms, offices, bedrooms, and other environments. They improve sound quality in recording studios, musical instrument workshops, and podcast studios. Note: Soundproof panels can effectively suppress noise by installing a sufficient number of panels, but they cannot completely block sound. 【Easy DIY Installation】The adhesive design of the soundproof sheets greatly simplifies the installation process. Adhesive is pre-applied to the back, so simply peel off the protective craft paper and press the sound-absorbing sheet into place. Make sure the surface is clean and dry before installing the soundproofing material.