For two door panels: ・Damping material: 10cm x 5cm, 20 sheets ・Sound absorbing material: 20cm x 20cm, 2 sheets By applying damping material and sound absorbing material together, the deadening effect can be dramatically enhanced. 【Damping Material】 It's an adhesive butyl tape, so you can use it immediately after peeling off the backing paper. Damping sheets absorb vibrational energy and significantly reduce the transmission of sound and vibration. By applying it to vibrating parts such as metal or resin surfaces, which are the cause of the problem, unpleasant noises such as "buzzing sounds" and "warbling sounds" are significantly reduced. It is an adhesive type, so no adhesive is required. Easy to process. Recommended for preventing buzzing sounds behind speakers, inside doors, and in the trunk. It's a large size, so you can cut it to fit the area you want to use it. Cutting can be easily done with scissors. 【Sound Absorbing Material】 Absorbs noise and improves the quietness of the car interior. It is effective when applied to the outer panel behind the speaker or other door panels. Combining this sound absorbing material with the damping sheet can be expected to provide 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 size, so please feel free to comment. We also accept sales of sound absorbing material only, so we are waiting for your comments. Due to product availability, specifications may differ, but please rest assured that it will not affect the effect. ※ Both the damping material and sound absorbing material are hand-cut, so there may be some slight errors, but please understand.