I know how you feel Frisco chewed up all my good stuff I have blankets on the walls in my room, and he chewed huge holes through my horse one (which was better than him chewing through my wolf ones atleast )
So I give the rats rawhide chips every day. They are neat little things, actually meant for small dogs, but are quite small.

Sounds like you have everything covered!

You naughty boy Julian! You stop chewing your mommy's precious belongings!