For those seeking the ultimate in soundproofing and sound quality improvement. This is a "premium sheet" with the highest quality and effect. It has the highest level of sound insulation and vibration damping performance. It consists of 4 layers and is a high-grade model that cuts out unpleasant elements in the car, such as road noise, engine noise, rain noise, and vibration, in addition to improving sound quality. --- ■ Overwhelming quietness created by the 4-layer structure Layer 1: Red aluminum layer ・Reflects heat and improves heat insulation ・Excellent durability and less likely to deteriorate even with long-term use Layer 2: 1mm high-quality butyl rubber layer ・Absorbs vibration and suppresses body resonance ・High adhesion, less lifting after installation Layer 3: 2mm MLV sheet layer ・Creates a "mass wall of sound" and maximizes sound insulation performance ・Overwhelming effect on road noise, wind noise, and external noise Layer 4: 2mm butyl rubber layer ・Adheres firmly to the base steel plate, enhancing vibration damping + fixing power ・Thoroughly blocks vibration sources with double butyl → All of sound absorption, sound insulation, and vibration damping are fused at a high level. The optimal structure for those who have not been satisfied with conventional soundproofing sheets --- ■ Reason for "strongest class" sound insulation performance • Sound is less likely to pass through when it has "mass" • This product has a total of 4 layers and a heavy structure of aluminum + butyl + MLV + butyl • Especially MLV is a "mass barrier material" adopted by the professional industry • Dramatically reduces road noise, rain noise, and the echoing sound of the tire house • The effect can be clearly felt even on long drives --- ■ Also the strongest class of vibration damping performance • Because the butyl layer has a 2-layer structure in the front and rear, the vibration control power is different • Suppresses "steel plate ringing" of doors, floors, etc. from the root • Measures against a wide range of vibrations from low frequency to high frequency • Many voices say, "The car settles down" and "The sound of the door closing changes to that of a luxury car" --- ■ Recommended for those who • Want a quiet car interior above all else • Want to improve speaker sound quality • Want to significantly reduce road noise, rain noise, and vibration • Want to get a "heavy silence" like a luxury car --- ■ Contents Extra thick 4 sheets (Per sheet: 80cm long x 46cm wide x 5mm thick) --- Shop Kazekobo also has many other products, such as lights and deadening, so please take a look at the hashtags and my page! #shopKazekobo'sSoundQualityImprovementCommittee With this one sheet, the interior environment of your car will change surprisingly. The strongest 4-layer deadening sheet for those who are serious about soundproofing and vibration damping.