Cardboard A4 Cardboard Sheets Cushioning Material Backing Board 10-Piece Set

This is an A4 size cardboard backing board.
I purchased a large quantity but no longer need it, so I am selling it. How about using it for cushioning material or packing?
This is a set of 10 sheets that fit in a Nekoposu dedicated box.
Immediate purchase is welcome.

Size: A4 (297mm x 210mm)
Thickness: Approx. 3mm
Weight: Approx. 30g/sheet

We also have a box of 50 sheets.
The number of sheets can be discussed.
Please leave a comment.