This is a great value set of three different deadening sheets. You can get the best of each sheet! ・I don't know which one to choose because there are so many types of deadening... ・I want to do a perfect installation all at once. ・I want the best sound quality possible! We created this in response to many requests like these! 【Contents】 ① Deadening Sheet Kai (Black) 2 sheets Approximately 800mm x 460mm per sheet Thickness over approximately 3.0mm ② Magic Insulation Jacket (Sound Absorbing Material) 2 sheets Approximately 800mm x 500mm per sheet ③ Deadening Sheet Kai (Blue) 200 sheets Approximately 10cm x 5cm per sheet Thickness approximately 2.6mm to 2.9mm 【Features】 ① The black sheet has been made extra thick, over 3.0mm, to improve vibration damping! By perfectly sealing large service holes, etc., and making it a single box, you can feel better sound quality. ② The sound-absorbing material improves sound quality by suppressing sound reflections and eliminating phase shifts. In addition, due to its heat insulation and heat retention effects, the air conditioner works better, keeping you cool in the summer and warm in the winter! ③ Unlike general-purpose products, the blue sheet is made thick, 2.6 to 2.9mm, to improve vibration damping! For other features, please see the individual product page. Shop Kaze Kobo also offers many other products, such as headlights, fog lights, and sound quality improvement sheets, so please check out the hashtags and my page! #shopKazeKoboSoundQualityImprovementCommittee 【Impressions】 This is my personal impression of using this set. By installing all three types, I felt the difference even more. Regarding sound quality, there was no reflected sound, and it improved dramatically. Regarding soundproofing, road noise was also reduced. Also, when I installed it on the ceiling, the sound of rain became significantly smaller, and I could really feel the difference. Recommended for those who are using Regetrex, Real Schild, and other deadening vibration damping sheets, vibration isolation materials, and damping materials. We support those who are challenging deadening with DIY!