If you're the type to do some stealing, this is what you're looking for on a construction site it can be more green in color or even dark brown/grey. You can cut it with a steak knife or any sufficiently sharp straight blade very easily into strips and it compresses easily by hand. It's pretty safe but if you use a serrated blade it'll create some fluffy bits don't eat them or whatever
Mineral wool or rock wool, sometimes called acoustic insulation board or fire resistant wool.
Most construction sites in the framing or drywalling stage will have it lying around everywhere
https://image.made-in-china.com/2f0j00ZQGYaRKMVrus/Fireproof-Mineral-Wool-Insulation-50mm.jpg
If you're the type to do some stealing, this is what you're looking for on a construction site it can be more green in color or even dark brown/grey. You can cut it with a steak knife or any sufficiently sharp straight blade very easily into strips and it compresses easily by hand. It's pretty safe but if you use a serrated blade it'll create some fluffy bits don't eat them or whatever
Mineral wool or rock wool, sometimes called acoustic insulation board or fire resistant wool.
Most construction sites in the framing or drywalling stage will have it lying around everywhere
Thanks! I'll have a look around online first lol.