It is easy to construct even if you hadn't done any housework before.Get rid of the tape coated back surface and fix them the tile on the wall .
XPE material called chemical crosslinked polyethylene foam ,it is non toixc,non smelling ,No harm sustance to person.We have REACH report of it.
-easy to clean
There is a pe film coated on the surface ,you could use a wet towel to clean it.
closed cell structure make the voice couldn't spread through.