Official [Made in Japan Soundproofing Sheet] Set of 24, 1.2mm Thick, Soundproof Fast Lab R. For [concerns about external noise] and [reducing sound leakage from rooms]. Soundproof sheet, soundproof mat, soundproofing material, soundproof room wall. Surface density: Approximately 2.1kg/ (30cm long x 30cm wide) 2.16 ‐ Mercari: Shop from Japan