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 silence 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 •Wide range of measures against low-frequency to high-frequency vibrations •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 •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 2 sheets (Per sheet: Length 80cm x Width 46cm x Thickness 5mm) --- Shop Kaze Kobo also has many other products, such as lights and deadening, so please check 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.