What kind of wood is ok for guinea pigs? I am planing to use some kind is wood instead of coroplast and then fleece covering it then news paper then bedding on top of that. And i was just wonderin what kind of wood was ok to put under the fleece.

Thank you for you answers!
im not talking about shavings i am talking about like wood planks then i am going to cover the wood planks with fleece then the fleece with news paper then the news paper with shaving




what i want to know is what kind of wood can i use for the planks??