Feature: 1. Multi functional design, professional sound control, sound suppression, acoustic treatment, noise reduction. 2. This soundproof sponge is made of high-quality polyurethane material, flame retardant, environmental friendly and durable. 3. With good appearance and acoustic characteristics, it is suitable for sound absorption, sound insulation, shockproof and fire protection. 4. Simple installation, widely used for indoor sound absorption treatment and indoor sound insulation. 5. High density, excellent performance, very suitable for the installation of office, studio, piano room, recording room, etc. Specification: