Product Specifications: 45cm * 45cm thickness: 5MM this product is 9.5 yuan / 45cm * 45cm, this product is sold by the piece, 4 = 1 square. Specific details can contact our customer service! Sound-absorbing carpets purposes: (1) interior wall and ceiling finishes (2) highly specialized studio, recording studio, audio equipment test chamber (3) broadcasting, surface acoustic equipment (4) theaters, conference rooms, indoor stadium, concert hall Gym (5) soundproof doors, soundproof walls and other barriers style wall mezzanine (6) library, reading room, exhibition hall, classrooms, nursery, piano chamber (7) heat insulation facilities and product surface (8) dance hall, KTV, hotel, workshop, office http://gd1.alicdn.com/imgextra/i1/2090024372/TB23lXybXXXXXaaXXXXXXXXXXXX_!!2090024372.jpg