Acoustic wall panels (California IP3)

White acoustic wall panels. Each panel measures 120cmsx60cms.
Good, clean condition. They have been stuck on a wall, so only two of them still have the original backing paper that you peel off the reveal the glue. The others probably still have enough glue to stick to another wall, but may need a little more glue (I’ve tried to show what the backs look like in photos).
I bought these to try to block out sound from to in next door flat but they didn’t work for that but they can improve the sound in the room they’re in, if that’s what you wanted to use them for.
Two of them have a bit of paint at the top edge on the back that they took from the wall they were on but it doesn’t show from the front of the panel.