Nichias Rock Wool Board, 16 Sheets, Sound Absorption and Insulation Material

Purchased for soundproofing, but ended up with too many, so I'm selling the excess.
It's difficult to tell from the exterior whether it's the 16-sheet thin cut or the 8-sheet thick cut, but it's likely the 16-sheet version.
It is packaged as shown in the second image.
*Although two items are shown in the third photo, only one is being sold.

?Size: 25mm (thickness) x 605mm x 910mm
?Quantity: 16 sheets / Weight: 1.1kg per sheet
?Density: Standard density 80kg/m3 / Material: Rock wool
?Standards: F☆☆☆☆ / JIS A 9504 / JIS A 6301 / Non-combustible certification NM-8600
?Uses: Sound absorption, sound insulation reinforcement, heat insulation