These are leftovers from what I used! Brand new, unused! I will lightly compress and ship with simple packaging! [Product Description] Material: Urethane foam Recommended use: Eco-friendly material Product dimensions: Length 30cm x Width 30cm x Thickness 5cm 12 pieces per pack *(24 pieces per pack also available! Please inquire via comments.)* Shipping method is listed as "Undecided," but may be changed, so please be aware. [High Density & Excellent Sound Absorption Performance] Compared to conventional sound absorption panels, our sound absorbing material is 5cm thick. The sound absorption panel uses strictly optimized polyurethane material and a high-density, extra-thick sponge of 25 kg/m³. The sound absorption sheet further enhances the soundproofing effect. The inside of the sound absorbing material is porous. The soundproofing sheet can convert the vibration of sound into thermal energy to attenuate the sound. Our sound absorbing material is useful for noise reduction. It reduces noise and vibrations transmitted to the walls and outside, keeping it quieter than before. [Excellent Material & Resilience] Our sound absorbing material uses polyurethane foam with excellent resilience and durability, and it quickly returns to its original shape even when folded. The sound absorbing material does not deform even after long-term use. The sound absorbing material is a substance with a high sound absorption ratio and can absorb noise. In addition to preventing sound from echoing too much, the sound absorbing material reduces the muddiness of sound due to reverberation and unnecessary low frequencies, adjusting the listening environment with clear sound, and only the good sound resonance is transmitted. It can be used for soundproof sheets, ceilings, windows, and walls of rooms. Sound absorbing material, soundproofing material, urethane foam, acoustics, soundproof sheet Thank you for viewing.