A*O様 [New, Unused] High-Density Sound Absorbing Boards, Set of 24, Includes Mounting Pins

Purchased for my family for a new life, but selling as it will not be used. The shipping cardboard box has been opened, but the product is new and unopened.

Product Description (Copied Below)

[Self-Adhesive] Soundproofing Material 200kg/m3 High-Density Sound Absorbing Panel for Walls, Sound Insulation, Sound Absorption, Noise Reduction, 30*30cm, Easy Installation, Interior Decoration, DIY, Flame Retardant, Moisture-Proof, Heat Retention, Rental Property, Peelable, with Push Pins, 24 Sheets, 2.16㎡, White

[200kg/m3 High Density & High Efficiency Sound Absorption]
The performance of sound-absorbing material is determined by its density. The higher the density, the better the sound absorption effect. This product uses a 200kg/m3 high-density material, and its sound absorption performance is 2.5 times that of conventional products. Enjoy high-quality sound in a quieter and more comfortable environment.
[Easy Installation & Free DIY]
The back of the sound-absorbing panel has a strong adhesive sheet, so it can be firmly fixed just by sticking it on. No special tools are required, and it can be easily installed by one person. It can also be freely cut to size and shape as needed, fitting perfectly into various spaces. The product is delivered uncompressed, so you can use it immediately upon arrival. Furthermore, you can use the included push pins to fix memos or specimens, making it useful in various everyday situations.
[Safe & Eco-Friendly & Good Durability]
The sound-absorbing board meets B1 flame retardant grade standards, effectively reducing fire risk, so you can use it with peace of mind. It uses sustainable materials, is non-toxic and odorless, and is harmless to health. It has excellent resilience and durability, is resistant to impact and difficult to deform, and does not easily sag or deteriorate with long-term use.
[Insulation & Energy Saving & Comfortable All Year Round]
The sound-absorbing panel not only has excellent soundproofing effects but also insulates against outdoor heat, stabilizing indoor temperature. It keeps you warm in winter and cool in summer, allowing you to spend your time comfortably all year round. Furthermore, it reduces air conditioner power consumption and saves costs. It realizes a more comfortable and economical life for your home.
[Installation Method & Applicable to Various Scenes] For optimal sound elimination and soundproofing effects, it is recommended to cover more than 70% of the wall surface with sound-absorbing panels. If only local sound quality improvement is needed, you can attach it to walls with strong reflections. It is widely used in various scenes such as home theaters, recording studios, offices, living rooms, bedrooms, and piano practice rooms. Additionally, if you want to enhance sound insulation, combining it with soundproofing sheets is recommended.