MDF milled with slots & holes---it is used to absorb and shrink the echo, when its back is covered with thin cloth.

MDF milled with slots & holes --- It is used to absorb and shrink the echo, when its back is covered with thin cloth: this is what we called Acoustic-absorbable boards

Acoustic - absorbable boards: is usually used together with the thin cloth: because the cloth is very helpful to absord the noise.

Size is customized by customers.

In another word: size is customization.

The following sizes are very common:

1220 x 2440 x 15mm

1220 x 2440 x 16mm

1220 x 2440 x 17mm

1220 x 2440 x 18mm

acoustic - absorbable MDF boards. MDF milled with holes & slots.