For those who are looking to try deadening for the first time, we recommend this set: ・Vibration damping material: 10cm x 5cm, 20 sheets ・Sound absorbing material: 10cm x 10cm, 4 sheets 10cm x 5cm, 2 sheets By applying vibration damping material and sound absorbing material together, you can dramatically enhance the deadening effect. 【Vibration Damping Material】 It's an adhesive butyl tape, so you can use it immediately after peeling off the backing paper. Vibration damping sheets absorb vibration energy and significantly reduce the transmission of sound and vibration. By applying them to vibrating parts such as metal or resin surfaces, which are the cause of the problem, you can significantly reduce unpleasant noises such as "rattling sounds" and "warbling sounds." It's an adhesive type, so no glue is needed. Easy to process. Recommended for preventing rattling sounds in the back of speakers, inside doors, and in the trunk. Because it's a large size, you can cut it to fit the area you want to use it on. Cutting is easy with scissors. 【Sound Absorbing Material】 Absorbs noise and improves the quietness of the car interior. It works effectively when applied to the outer panel behind the speaker or other door panels. By combining this sound absorbing material with the vibration damping sheets, you can expect even higher soundproofing effects. This can also be easily cut with scissors, so it can be applied to various locations. It has double-sided tape, so you can apply it immediately after peeling off the backing paper. Also, for shipping purposes, it is sealed, but it will return to its original state after a while after opening, so don't worry. We also accept changes in the number of sheets and sizes, so please feel free to comment. We also sell sound absorbing material only, so we are waiting for your comments. ※ Both the vibration damping material and sound absorbing material are hand-cut, so there may be some slight errors, please understand. Type of car audio... Deadening kit