Well these are ok:

News paper

"CareFresh"

Pine

Aspen

***on wood/loose substrates just be sure your snake doesn't ingest the substrate.***

what i DON'T recommend is CEDAR or WOOD CHIPS,

*Cedar is poisonous to snakes

*Wood chips hold more bacteria than you can imagine (after they have be soiled a few times)

hope that helps

~ZF
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Bklyn's Finest Brooksi & Goini Fanatic