I thought this was funny. I could not find any tubes locally for my chin Rigsby to play in,when he is out of his cage. I made a bunch by rolling heavy cardstock type paper together.(only to run through out of his cage, with supervision) He went through one once(I made 6). Then ignored them for a couple of weeks. 3 days ago he jumped up on to a chair, looked at the tube on the floor and jumped on it,flattening it like a pancake. Now for 3 days this is what he does over and over again until all are flat! They do pop back together,but only for so long.One had to be thrown out already. Its so funny, its like he just wants to kill those silly tubes his owner made!, lol!:laughitup: