Mr.MELAMINE FOAM SHEET FOR FLAT FINISH (GT105)

From the manufacturer:

"This is a thin melamine foam sheet for flat finish that makes the best use of a model's original color and finishes naturally.
The special compressing system makes the foam sheet 4 times durabler than normal ones.
Two types are available. ;The sheet type for file, sponge, and water resisting paper/The separeted type with a stick."