Official [Made in Japan Soundproofing Sheet] 120-sheet set, 1.2mm thick, Soundproof Fast Lab R. For concerns about [noise from outside] and [reducing sound leakage from rooms]. Soundproof sheet, soundproof mat, soundproofing, soundproofing material, soundproof room wall. Surface density: Approximately 2.1kg / (30cm x 30cm) 10.80 ‐ Mercari: Shop from Japan