This is a great value set of three types of deadening sheets, sound-absorbing material, and a roller. You can get the benefits of each sheet! ・I don't know which deadening sheet to choose because there are so many types... ・I want to do a perfect installation all at once. ・I want the best sound quality possible! We created this set in response to many requests like these! 【Contents】 ① Deadening Sheet Kai (Black) 4 sheets Approximately 800mm x 460mm per sheet Thickness: Over 3.0mm ② Magic Insulation Jacket (Sound Absorbing Material) 4 sheets Approximately 800mm x 500mm per sheet ③ Deadening Sheet Kai (Blue) 400 sheets Approximately 10cm x 5cm per sheet Thickness: Approximately 2.6mm to 2.9mm ④ Shokupan (Speaker Back Sound Absorbing Material) 2 pieces Approximately 200mm x 200mm x 50mm per piece ⑤ Castella (Speaker Surround Sound Absorbing Material) 2 pieces Approximately 25mm x 25mm x 590mm per piece ⑥ Two types of rollers Length: Approximately 18cm Width: 2cm and 4cm 【Features】 ① The black sheet is extra thick, over 3.0mm, to improve vibration damping! By perfectly sealing large service holes and creating a single box, you can experience better sound quality. ② The sound-absorbing material improves sound quality by suppressing sound reflections and eliminating phase shifts. In addition, the heat insulation and heat retention effects improve the efficiency of the air conditioner, keeping you cool in the summer and warm in the winter! ③ Unlike general-purpose products, the blue sheet is thick, 2.6 to 2.9mm, to improve vibration damping! For other features, please see the individual product pages. Shop Kaze Kobo also sells many other products, such as headlights, fog lights, and sound quality improvement sheets, so please check out the hashtags and my page! #shopKazeKoboSoundQualityCommittee 【Impressions】 This is my personal impression of using this set. I felt a greater difference when I installed all three types. Regarding sound quality, there were no reflected sounds, 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 quieter, and I could really feel the difference. Recommended for those who are using Regetrex, Real Schild, and other deadening vibration damping sheets, vibration-proof materials, and damping materials. We support those who are challenging deadening with DIY!