Excellent soundproofing: According to soundproofing tests (see video), the sound transmission loss at 1000Hz is 19dB, demonstrating very high soundproofing performance. By using our polyester fiberboard (density 200kg/m3) in conjunction, the sound transmission loss can be further increased. This set of 6 soundproof sheets, 1.2mm thick, aims to solve external noise problems and reduce sound leakage from inside the room. The surface density is approximately 2.17kg/㎡. These soundproofing and vibration-damping products are designed for noise reduction, with dimensions of 30cm (length) x 30cm (width). 18.68 ⭐️Free Shipping⭐️ Please check the actual product photos for the condition. #Mii's Shop Product List is here ✨ ＊Instant purchase is welcome, silent purchase at midnight is OK ◎ ＊First come, first served for single items ＊Welcome bulk purchases, feel free to comment ・Please understand that items are stored at home and shipped in simple packaging. (⁎ᵕᴗᵕ⁎) ・Please check the actual product photos for the condition. ※To offer the lowest possible price, we may ship the item without the box due to shipping costs.