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I figured I'd check with you guys first because you always seem to know about these things. 
My first guess is that they seem mostly paper to me. I heard you can't use cardboard in paper pulp, but I was thinking that the rolls might be more paper than cardboard.
It would sure be nice to recycle them. We go through a lot of toilet paper here and it always seems like such a shame to just throw those little cardboard tubes away.
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Here in the U.S., ours are obviously cardboard.
If you don't want to make pulp from cardboard (you can, but sometimes the results aren't quite the same as with paper), you might consider using the tubes bundled together as a lightweight inner form. Use masking tape to fasten them together, as many as you need, and PM from there.
Sue
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It would be a waste of time trying to pulp them. However much work you do on them it is still likely to be very lumpy - not worth the effort.
As Sue says, they are strong in the vertical and great for building armatures. You can make them even strong by squeezing one tube into a figure of 8 in its cross section (or a U) and inserting it an unsqueezed roll. The result is VERY strong.
DavidO
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I'll try them in an armature for sure then. Thanks for the tip!
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