Soundproof sheet, thickness 2mm, surface density approx. 3.5kg/㎡, easy-to-handle size, lightweight, soft, soundproof sheet, soundproofing measures, indoor, piano, keyboard, soundproofing, vibration-damping products, soundproofing, noise reduction, 30cm x 30cm, soundproofing material (4.32㎡ (48 sheets)) Includes main unit, instruction manual, and original box. The original box has some damage. This item is as good as new, but please understand this before purchasing. *Please note that this is an overseas product, so there may be minor scratches and stains. *Please note that we cannot ship to Okinawa, remote islands, Hokkaido, and Kyushu. [Thickness 2mm] The sound insulation effect is influenced by the surface density of the soundproof sheet. By increasing the thickness to 2mm and reaching a surface density of 3.5 kg/㎡, the soundproofing effect is doubled compared to general soundproof sheets. It has excellent sound insulation performance with an acoustic transmission loss of 23dB at a frequency of 1000Hz. Also, there is no radio wave interference (disruption of wireless LAN and mobile phones). [Easy to install] The soundproof sheet size has been improved to 30cm x 30cm, and each sheet weighs only 0.315kg. It is a convenient soundproofing measure that can be easily installed even by non-professionals. It solves the problems of "difficult installation due to large area, inability to cut well, and waste due to lack of appropriate size." [Safe Material] The soundproof panel uses soft PVC material, which is eco-friendly and flame-retardant. In addition, it is waterproof and moisture-resistant due to its high density, so you can use it with peace of mind. [Wide range of uses] When used in combination with compatible sound-absorbing materials (sold separately by our company), it can significantly enhance the sound absorption effect and soundproofing performance through a synergistic effect. It can be used in various situations such as rooms, audio rooms, studios, home theaters, soundproof walls in apartments, and car deadening.