Sound proof acoustic panel

sound proof acoustic panel
GLASS WOOL OR ROCK WOOL INSIDE.

double layer thickness: 1 mm or 0.6 mm

one side with hole 3mm diameter ， 6mm distance
,one side plain.

95CM width,
length ： 298CM or 580 CM
thickness 5 CM or 10 CM

Material：Glass wool or Rock wool
Density： 40KG/100M or 80kg