You're looking for information on Sonofka 3D and its paper covering. Sonofka 3D is a type of acoustic material used for sound absorption and insulation. Here's what I found:
Sonofka 3D is a three-dimensional acoustic material designed for sound absorption and insulation applications. It is a type of open-cell, melamine-based foam that is engineered to provide excellent sound absorption properties while being lightweight and easy to install. sonofka 3d