Actually it is OK,I was reading all about it online.Anything that a human uses for personal use is good...:P And toilet paper rolls are recomended in just about any book or website or blog that has anything to do with gerbil chew toys.:)
Are you sure about Toilet paper tubes being safe to chew?...mine have glue on em,2 lines to help the paper stick....cant be good for any animal to chew glue ,can it?
You can also use kitchen paper rolls,cardbord boxes (stay away from cereal boxes),kleenex boxes,paper plates,grocery paper bags,and lable rolls.:))
Toilet paper tubes.They're safe for the gerbils to chew on,plus they have loads of fun running in and out of the tube.:)
I wanna know other kinds of cardboard besides the rolls....