Bamboo strip?

[onoshi]

idk how but i have 10 already and i need some more but I have no idea what drops it and my bestiary doesn't have any info on them.

[Kori]

They drop from the lantern thingys.....I know the cave in Northen part of Kamuso village....umm....the Iwgana one I think? has them

[Sorozone]

They drop from the creepy lanternes that can burn themselves and tackle you. they normally have really low hp / defenses but they can kill you in one hit if you're not careful.