Official 【Made in Japan Soundproofing Sheet】 Set of 60 sheets, 1.2mm thick, Soundproof Fast Lab R. 【For concerns about external noise】 and 【To reduce sound leakage from rooms】 Soundproof sheet, soundproof mat, soundproofing material, soundproof room wall. Surface density: Approximately 2.1kg/ (30cm long x 30cm wide) 5.40 ‐ Mercari: Shop from Japan