What are some products that are used for acoustics in a building?

Can you describe it for me? And what it looks like and stuff? Because I’m trying to draw a product that is used for acoustics in a building because I’m the president/leader of my Science Club and we are working on ’‘sound’’ this week. And so I wanna show them a product that is used for acoustics in a building. And this IS NOT homework because our club is just for fun! And we aren’t science dorks either. We started this club 1. because we love doing experiments 2.We are a group of friends who like to get together a lot and we get bored easily so why not do a bunch of experiments? and 3. We all LOVE science class so why not get extra credict by having fun! And our club isn’t boring! Every 30 minutes we make snacks and go on the internet to look up more experiments to do that have to do with our topic. And trust me we have fun during the club part. We show each other little projects that we make, we watch tv a lot, and trust me it isn’t boring. But ANYWAY please answer my question because I really want to bring it to show it at my science club (which by the way is at my house) and it’s tomorrow so please hurry!