It is the best hard type board for sound absorption. You can design for any purpose with this one.This is used for the lining material instead of MDF on the wall.100% of polyester fiber.So it has no injury to human body like regular polyester cloths.No color changes under sunlight.When absorbing water, it will be evaporated easily to 99.9%, so keep it from getting moldy,bacteria, etc.There are no deformed by weathering.