For the record this could be considered personal opinion.
But i never buy anything from Dr foster and smith. They claim to be vets but sell lots of products that are dangerous for chins. I left reviews on several items and food explaining the dangers of them to chins. I also answered a few questions left by other ppl. They sent me back emails saying that every single one of my responses 'did not meet there standard' and refused to post a single one. The only thing they did accept was a suggestion for another product. I find it despicable and will never buy from them again.
On topic - Cardboard tubes can work but you have to watch how your chin handles them. My chins like to not only chew or tear cardboard up, they actually like to EAT the cardboard. So i cant even use that around mine.